This one is a pretty fun site. You earn by doing offers or clicking. There are several PTC contests. Also, if you report invalid offer links you get rewarded. I've earned a little by doing that too :)
I received my first payment in February for January's work-- and in March I should have a little larger payment.
There is a TON of offers on this site. I really like the layout too.
2/23/08- $1.80 (click to see payment image)
3/25/08- $4.41 received (click to see payment image)