An Item of Power is what makes your base raidable. Once you have one you have to set two windows in which your base can be raided. They also give a small boost to a certain aspect in PvE. I'm not sure what all of them are, but I know one is +1% damage, and another is +1% XP.
The main focus of a raid is to steal the IoP. The only other way to get one is to complete the Cathedral of Pain trial (available from the SG Mission Computer eventually). The trial isn't currently available on the live servers though, and when it is, it will only be available for 5 out of every 60 days (although that may change by the time it is actually available).
Appears as a huge stone ball with a vague glow or aura around it, in one of four colours depending upon it's purpose. In addition to the two types mentioned above, one gives -1% debt for all SG members and I _think_ the final type is +1% damage resistance.
Hope this helps 
there are also 2 uber IOP's that have a higher increase than those listed above. No clue what they are but theres only ever one of each of them per server...
Defiant
Proud Member of the Liberty Legion
Venture - Emp/En Defender
Seph - Kat/SR Scrapper
Blizzard - Ice/Storm Controller
Legionelosis - Rad/Rad Defender
If the IoP does what it describes, then:
a) it's bloody expensive
b) the boost is laughingly small
c) because it makes your base raidable, it also means you need even MORE money for defences, and in case of a raid, can loose a lot of money due to damaged SG items.
d) basicly, it seems to be a waste of time :/
There's:
Damage Increase
Debt Reduction
XP Increase
Psionic Damage Resistance
All come in both 1% (common), 5% (rare) and 20% (or 25%, I forget) (VERY, VERY rare - 2 per server).
The 2 Uber IoPs are Damage and Debt if I remember.
There are a couple of Super Uber IoPs available,apparently.
The True Furnace: (clicky): small portable sun that gives +1,000,000 base Energy and radiates +10 End for all SG members while in SG mode. Plus it looks nifty.
The True Book: complete chronicles of Rularuu that give all SG members 20% Debt Protection while in SG mode.
Those are pretty well worth it... again, only one each per server, though, and you'd better be prepared to defend them if you get them.
Is it time for the dance of joy yet?
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There are a couple of Super Uber IoPs available,apparently.
The True Furnace: (clicky): small portable sun that gives +1,000,000 base Energy and radiates +10 End for all SG members while in SG mode. Plus it looks nifty.
The True Book: complete chronicles of Rularuu that give all SG members 20% Debt Protection while in SG mode.
Those are pretty well worth it... again, only one each per server, though, and you'd better be prepared to defend them if you get them.
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What possible use is a million energy? I'd settle for having 500 control..
ok this is bugging me, what exsactly is an item of power and what is its role in an SG. yes i have checked around the other boards and posts but no one actuely says what thay are or what thay do, i know thay can get taken in raids but other than that im not sure...
(sorry if im been incredibly thick, i havent been on the game for a while and have only just made a comeback)