Verified answer

If you don't mind earning a few cents by doing really repetitive tasks, take a look at Amazon's Mechanical Turk. An example task would be when they gave you a whole bunch of random Google Earth photos that you could look through to see if you could find Steve Fossett's plane. That pays money rather than credits, but cash is good too, right? Right.

http://www.mturk.com/mturk/welcome