abolat: Well, I never got how the gmg referral thing works... I seem to have 3 friends but no credits thus far... I think they haven't bought anything or something :) Why use a referral and not buy for a year, I have no idea... anyway, if someone is looking to get an extra $2 credit, here is my link:
http://www.greenmangaming.com/?gmgr=suzatehu GMG referral only works if the person registers there, through your link. And then if/when he ever spends his *first* $2, both you and the referred person will gain $2.
Used to be $5 even, I got a lot of free money from that by linking the free games a few times and some of those people actually spending money later ^^
@above, I don't think you see anything in particular when you do this.
Foxhack: GMG is good for Steam keys.
Everything else... I avoid.
nijuu: +1 you aint the only one bro :)
At this point you could also argue that you can get Origin keys there as well as they've also added the EA library now :)