I like Checkpoints when I get easy opportunities! Being in between jobs has not been easy and I really enjoy doing the missions for some of the other guys. My favorite newbie is iPoll. I have it on my iPhone and my wife on her android.

Just yesterday, I got to do some really cool things for the Olympics at a local restaurant! Last week I went on a secret mission into a Target store and snapped a picture of a yoplait yogurt. The company is pretty good about catching cheaters so be careful!

All in all I have made $480 on iPoll and but only points for rewards on Checkpoints.

A couple others that I downloaded and am starting to use lately; Gigwalk and shop kick! No missions, just discounts, no real cash rewards either
http://www.ipoll.com/go1.html