I would look here first. Cap'n Canadian does a good job summarizing IOs at the beginning level, though he covers mostly frankenslotting techniques not sets. Still, he does point to Paragonwiki, City of Data and Mid's.
http://wiki.cohtitan.com/wiki/IO_Sets
If you are looking for a specifci type of boost, the wiki catwgories are great. Such as:
http://wiki.cohtitan.com/wiki/Catego..._Melee_Defense
@Catwhoorg "Rule of Three - Finale" Arc# 1984
@Mr Falkland Islands"A Nation Goes Rogue" Arc# 2369 "Toasters and Pop Tarts" Arc#116617
Another great way to check out IO sets is through Mids itself. You'll be a little less overwhelmed by all of the sets out there because Mids narrows it down to only the sets you can place into whatever powers you are looking at.
Play around with your build a little while, check out what sets can go into what types of powers, and you'll get a feel for it all pretty quickly.
Awesome! Thanks guys.
Ya know, is it just me or is the scrapper forum WAAAAY more helpful/friendly than the others?
Until we stab someone in the face that is... 
Don't get too sentimental or we'll split you in a half, cleave your head, steal your soul, incinerate you with flaming fists, roundhouse kick you in the throat and cut you in one thousand pieces.
...maybe I was just trying to get you in closer so I could...
STAB! STABBY STABBY STAB STAB...IN DA FACE!!!! MUAHAHAHAHAHA...
ya...sorry 'bout that...ahem...
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Another great way to check out IO sets is through Mids itself. You'll be a little less overwhelmed by all of the sets out there because Mids narrows it down to only the sets you can place into whatever powers you are looking at.
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Mid's also has the "Set Bonus Finder" under "Windows" on the file menu. If you're looking for specific bonuses that you want, it's quite handy.
@Johnstone & @Johnstone 2
ediblePoly.com
All my characters
Where can I find a comrehensive list of all of the IO sets? If one exists that is. I want to start looking into the sets but I feel a bit overwhelmed by all of the different choices and opinions floating around out there!
Thank you.