IOs are generally a better idea to worry about when you hit level 50 and have a lot larger income.
IOs are a new form of enhancement that you can craft or buy ready made from other players via trade or the auction houses. They generally increase your overall performance, ie % of damage, accuracy, endurance, recharge etc, as well as offering useful Set Bonuses from using more than one of the same IO set.
I'm not an expert, the best place to look is probably in the "Inventions" section of the forums.
IOs in general give better bonuses than SOs at your level. IOs that affect multiple attributes are a bit better than IOs that affect just one (2x acc/dmg IO is better than 1x acc, 1xdmg IO), slotting multiple IOs from the same set give you small bonuses. You cannot have the same named IO (ie. Devastation: Acc/Dmg) in a power more than once (but you can have Decimation: Acc/Dmg and Devastation: Acc/Dmg or Devastation: Acc/Dmg and Devastation: Dmg/Rech in a power). There are also Uniques that can be only slotted once in your entire build. And procedures that add extra effect to your powers when you activate them. (% of lethal damage, % of build-up, etc.) Try to aim for IO combinations that give you best combination of acc/dmg/rech/end.
[b][color=blue]Coldest War /[color=red]/ Omega Patient[/b]
[url="http://www.the-cow.net/"][color=red]The CoW Network (Blog) /[/url][url="http://www.collegeofwar.com/"][color=blue]/ College of War[/url]
Good description... but remember that the bonuses of Invention IOs will typically be higher per individual enhancement than Sets. If choosing Sets it pays you to research what you need and what's available throughout the entire range. It can take a bit of doing so don't be scared to experiment and don't worry about messing up it happens to all of us.
Thelonious Monk
Hey guys could ye help me slot this build show me what would be best to go in were please doint look at when i ability was slotted my mids sloting sestem is a bit messed up thx 
Hero Plan by Mids' Hero Designer 1.30
http://www.honourableunited.org.uk/mhd.php
Level 50 Magic Blaster
Primary Power Set: Electrical Blast
Secondary Power Set: Electricity Manipulation
Power Pool: Fitness
Power Pool: Leaping
Power Pool: Speed
Ancillary Pool: Cold Mastery
Hero Profile:
Level 1: Lightning Bolt -- Empty(A), Empty(3), Empty(3), Empty(5), Empty(5), Empty(43)
Level 1: Electric Fence -- Empty(A)
Level 2: Charged Brawl -- Empty(A), Empty(7), Empty(7), Empty(9), Empty(9), Empty(43)
Level 4: Ball Lightning -- Empty(A), Empty(11), Empty(11), Empty(13)
Level 6: Swift -- Empty(A), Empty(13)
Level 8: Combat Jumping -- Empty(A), Empty(15)
Level 10: Havoc Punch -- Empty(A), Empty(19), Empty(19), Empty(21), Empty(21), Empty(43)
Level 12: Short Circuit -- Empty(A), Empty(15), Empty(17), Empty(17)
Level 14: Super Jump -- Empty(A), Empty(23), Empty(23)
Level 16: Health -- Empty(A), Empty(25), Empty(25)
Level 18: Aim -- Empty(A), Empty(27), Empty(27)
Level 20: Stamina -- Empty(A), Empty(29), Empty(29)
Level 22: Build Up -- Empty(A), Empty(31), Empty(31)
Level 24: Lightning Field -- Empty(A), Empty(31), Empty(33)
Level 26: Hasten -- Empty(A), Empty(33), Empty(33)
Level 28: Thunder Strike -- Empty(A), Empty(34), Empty(34), Empty(34), Empty(36), Empty(46)
Level 30: Lightning Clap -- Empty(A), Empty(36), Empty(46)
Level 32: Thunderous Blast -- Empty(A), Empty(36), Empty(37), Empty(37), Empty(37), Empty(39)
Level 35: Power Sink -- Empty(A), Empty(39), Empty(39), Empty(40)
Level 38: Voltaic Sentinel -- Empty(A), Empty(40), Empty(40)
Level 41: Snow Storm -- Empty(A), Empty(42), Empty(42), Empty(42)
Level 44: Frozen Armor -- Empty(A), Empty(45), Empty(45), Empty(45), Empty(46)
Level 47: Hibernate -- Empty(A), Empty(48), Empty(48), Empty(48)
Level 49: Tesla Cage -- Empty(A), Empty(50), Empty(50), Empty(50)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Defiance
------------
[u]Set Bonus Totals:[u]
Code:[/color]| Copy & Paste this data chunk into Mids' Hero Designer to view the build |
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Any one 
I will try to take a look when I get home so I can import your build to Mid's. It would be helpful to know which are your priorities, if you are looking mainly for +regen or +recovery, then certain sets will be more appropriate and if you are looking for (let's say) +acc and +rchg other sets will be in order...
THx dude i doint realy now im mainlay a sapper so end drain is good and anything ells that will help me servive couse as a blasters its couse i draw alot of agro on me
Mmmm, this is just a suggestion, I've moved a few slots but didn't change the power selection. Bear in mind I am not too familiarized with blasters, so I tried to pick up a bit of everything, +dmg, +regen, +acc, +rchg
At least, it should give an idea of where to start so you can modify it to your own preferences:
Hero Plan by Mids' Hero Designer 1,30
http://www.honourableunited.org.uk/mhd.php
Elec - Elec: Level 50 Magic Blaster
Primary Power Set: Electrical Blast
Secondary Power Set: Electricity Manipulation
Power Pool: Fitness
Power Pool: Leaping
Power Pool: Speed
Ancillary Pool: Cold Mastery
Hero Profile:
Level 1: Lightning Bolt -- Thundr-Acc/Dmg:50(A), Thundr-Dmg/EndRdx:50(3), Thundr-Dmg/Rchg:50(3), Thundr-Acc/Dmg/Rchg:50(5), Thundr-Acc/Dmg/EndRdx:50(5), Thundr-Dmg/EndRdx/Rchg:50(43)
Level 1: Electric Fence -- Acc-I:50(A)
Level 2: Charged Brawl -- Mako-Acc/Dmg:50(A), Mako-Dmg/EndRdx:50(7), Mako-Dmg/Rchg:50(7), Mako-Acc/EndRdx/Rchg:50(9), Mako-Acc/Dmg/EndRdx/Rchg:50(9), Mako-Dam%:50(43)
Level 4: Ball Lightning -- Posi-Acc/Dmg:50(A), Posi-Dmg/EndRdx:50(11), Posi-Dmg/Rchg:50(11), Posi-Dmg/Rng:50(13), Posi-Acc/Dmg/EndRdx:50(23), Posi-Dam%:50(46)
Level 6: Swift -- Run-I:50(A)
Level 8: Combat Jumping -- Ksmt-Def/EndRdx:30(A), Ksmt-ToHit+:30(15), Krma-ResKB:30(36)
Level 10: Havoc Punch -- Mako-Acc/Dmg:50(A), Mako-Dmg/EndRdx:50(19), Mako-Dmg/Rchg:50(19), Mako-Acc/EndRdx/Rchg:50(21), Mako-Acc/Dmg/EndRdx/Rchg:50(21), Mako-Dam%:50(43)
Level 12: Short Circuit -- Sciroc-Acc/Dmg:50(A), Sciroc-Dmg/EndRdx:50(13), Sciroc-Dmg/Rchg:50(15), Sciroc-Acc/Rchg:50(17), Sciroc-Acc/Dmg/EndRdx:50(17), Sciroc-Dam%:50(23)
Level 14: Super Jump -- Jump-I:50(A)
Level 16: Health -- Numna-Regen/Rcvry+:50(A), Numna-Heal:50(25), RgnTis-Regen+:30(25)
Level 18: Aim -- RechRdx-I:50(A), RechRdx-I:50(27), RechRdx-I:50(27)
Level 20: Stamina -- EndMod-I:50(A), EndMod-I:50(29), EndMod-I:50(29)
Level 22: Build Up -- RechRdx-I:50(A), RechRdx-I:50(31), RechRdx-I:50(31)
Level 24: Lightning Field -- EndRdx-I:50(A), EndRdx-I:50(31), HO:Nucle(33)
Level 26: Hasten -- RechRdx-I:50(A), RechRdx-I:50(33), RechRdx-I:50(33)
Level 28: Thunder Strike -- Sciroc-Acc/Dmg:50(A), Sciroc-Dmg/EndRdx:50(34), Sciroc-Dmg/Rchg:50(34), Sciroc-Acc/Rchg:50(34), Sciroc-Acc/Dmg/EndRdx:50(36), Sciroc-Dam%:50(46)
Level 30: Lightning Clap -- Acc-I:50(A)
Level 32: Thunderous Blast -- RechRdx-I:50(A), RechRdx-I:50(36), RechRdx-I:50(37), Dmg-I:50(37), Dmg-I:50(37), Dmg-I:50(39)
Level 35: Power Sink -- P'Shift-EndMod:50(A), P'Shift-EndMod/Rchg:50(39), P'Shift-EndMod/Acc/Rchg:50(39), RechRdx-I:50(40)
Level 38: Voltaic Sentinel -- HO:Nucle(A), EndRdx-I:50(40), RechRdx-I:50(40)
Level 41: Snow Storm -- EndRdx-I:50(A), EndRdx-I:50(42), Slow-I:50(42), P'ngTtl--Rchg%:50(42)
Level 44: Frozen Armor -- S'dpty-Def/EndRdx:40(A), S'dpty-Def/Rchg:40(45), S'dpty-Def/EndRdx/Rchg:40(45), S'dpty-Def:40(45), S'dpty-EndRdx:40(46)
Level 47: Hibernate -- RechRdx-I:50(A), RechRdx-I:50(48), Heal-I:50(48), EndMod-I:50(48)
Level 49: Tesla Cage -- P'Shift-Acc/Rchg:50(A), P'Shift-EndMod/Acc/Rchg:50(50), P'Shift-EndMod/Acc:50(50), P'Shift-EndMod/Rchg:50(50)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Defiance
------------
[u]Set Bonus Totals:[u]
- [*]+6% DamageBuff[*]+2,5% Defense(Energy)[*]+6,25% Defense(Psionic)[*]+10% Defense(Ranged)[*]+7,5% Defense(AoE)[*]+37% Enhancement(Accuracy)[*]+6,25% Enhancement(RechargeTime)[*]+14% FlySpeed[*]+90,4 (7,5%) HitPoints[*]+14% JumpSpeed[*]+Knockback (Mag -4)[*]+MezResist(Held) (Mag 6,6%)[*]+MezResist(Immobilize) (Mag 6,6%)[*]+8,5% Recovery[*]+36% Regeneration[*]+1,58% Resistance(Fire)[*]+1,58% Resistance(Cold)[*]+6,25% Resistance(Negative)[*]+3,13% Resistance(Toxic)[*]+14% RunSpeed[/list]------------
[u]Set Bonuses:[u]
[u]Thunderstrike[u]
(Lightning Bolt)
- [*] +2% Recovery[*] +2,5% Defense(Energy)[*] +7% Enhancement(Accuracy)[*] +4% Movement Increase[*] +2,5% Defense(Ranged)[/list][u]Mako's Bite[u]
(Charged Brawl)
- [*] +MezResist(Immobilize) (Mag 3,3%)[*] +18,1 (1,5%) HitPoints[*] +3% DamageBuff[*] +MezResist(Held) (Mag 3,3%)[*] +3,75% Defense(Ranged)[/list][u]Positron's Blast[u]
(Ball Lightning)
- [*] +2,5% Recovery[*] +1,575% Res(Fire, Cold)[*] +9% Enhancement(Accuracy)[*] +6,25% Enhancement(RechargeTime)[*] +3,13% Resistance(Toxic)[/list][u]Kismet[u]
(Combat Jumping)
- [*] +1,5% Recovery[/list][u]Karma[u]
(Combat Jumping)
- [*] +Knockback (Mag -4)[/list][u]Mako's Bite[u]
(Havoc Punch)
- [*] +MezResist(Immobilize) (Mag 3,3%)[*] +18,1 (1,5%) HitPoints[*] +3% DamageBuff[*] +MezResist(Held) (Mag 3,3%)[*] +3,75% Defense(Ranged)[/list][u]Scirocco's Dervish[u]
(Short Circuit)
- [*] +10% Regeneration[*] +3,13% Resistance(Negative)[*] +9% Enhancement(Accuracy)[*] +3,13% Defense(AoE)[*] +3,13% Defense(Psionic)[/list][u]Numina's Convalescence[u]
(Health)
- [*] +12% Regeneration[/list][u]Scirocco's Dervish[u]
(Thunder Strike)
- [*] +10% Regeneration[*] +3,13% Resistance(Negative)[*] +9% Enhancement(Accuracy)[*] +3,13% Defense(AoE)[*] +3,13% Defense(Psionic)[/list][u]Performance Shifter[u]
(Power Sink)
- [*] +5% Movement Increase[*] +22,6 (1,88%) HitPoints[/list][u]Serendipity[u]
(Frozen Armor)
- [*] +4% Regeneration[*] +9,04 (0,75%) HitPoints[*] +3% Enhancement(Accuracy)[*] +1,25% Defense(AoE)[/list][u]Performance Shifter[u]
(Tesla Cage)
- [*] +5% Movement Increase[*] +22,6 (1,88%) HitPoints[*] +2,5% Recovery[/list]
Code:[/color]
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There are ome powers I never used myself, so I tried to keep them on regular IO slotting, but probably they are not at its best, someone more versed in blasters than me could give you better advice, I only tried to put together a few sets that enhance your regen, your acc and your dmg
thx dude!
hey guys i just got my elec/elec blaster to 37 its my highest char and i got no idea hou these IO stuff works could someome please alaberate on it,were i get em hou they work,hou mutch will they omprove my char etc ty all!!