I bled YourFree360Games pretty dry in 2007/2008. It's one where you sign up for "offers" with a credit card, and then cancel before the trials are up. All the offers I did were between $0 and $4 or so (except for eMusic, which was $10 and worth joining anyway). You have to be VERY CAREFUL not to miss the trial end date--some of them charge $60+ the instant they expire. But, if you do it right... you can get a hell of a lot out of it.
My total:
Offers: 16, about $23.00 all together (again, $10 was eMusic)
Games:
4000 Marketplace Points
Simpsons: The Game
Guitar Hero III Bundle
Rock Band (Game Only)
Guitar Hero III Bundle
Rock Band Guitar
Grand Theft Auto IV
Guitar Hero World Tour (Guitar bundle)
I returned one GHIII bundle to Amazon and got $105 credit for it. I don't think they let you do that anymore. Anyway, it was around $600 worth of games for that $23.00. I kept track of everything in an Excel spreadsheet, and had no problem canceling offers or getting credit (sometimes it didn't happen automatically, but the ticket system never failed). I was working from home at the time, so I could spend the time to do it right, which is the only way you should bother. Also, I used a credit card I didn't normally use, and could cancel if I needed to.
Also, while all my games came from the standard 2-credits-per-game deal, you can also get them from 2 referrals and one offer. So, if you do sign up, feel free to use my referral URL below.
http://www.yourfree360games.com/index.php?ref=242621But just, seriously, be careful. If you do it, stay 100% on top of it, and make sure you know the cancellation policy and contact info for each offer BEFORE you complete it. This thread at CheapAssGamer.com is invaluable, because people post their experiences with each offer, along with all the needed contact info:
http://www.cheapassgamer.com/forums/showthread.php?t=173655