Trialclix offers all the stuff the free sites do (and more), btu you don't need to get referrals. Just complete offers yourself for points. I haven't been there long, so far I've only earned a $25 amazon certificate. It's great for the smaller stuff like Ipods, etc, but the big stuff like laptops has to be pretty hard to earn enough points. Overall nice site...
http://www.trialclix.com/index.asp?refID=89654
