Check out my Side Money/Gift Cards page where I review and explain all of the details of several invective sites that I use or have used.
Since October of last year I have earned about $100 in checks and $200 in Amazon.com gift cards. I got a laser printer, ergonomic mouse and an X-Box Live 1 year subscription for zero dollars out of pocket! These were things that I would not have been able to buy for myself, but I just used what I call "free money" and you can too!
Check out my page with visual motivation for joining and using incentive based sites here --------> Side Money/Gift Card Account Screenshots