I've written positively about Instant Cash Sweepstakes before (I still wish they would change their name though. -_-) You answer a few user-created (and some sponsored) 3-question surveys and you win "tickets", "coins", and/or a few cents in actual cash. You can play every 3 hours, and once a day they hold a $50 prize drawing which you are automatically entered in with all the tickets you've won that day. You can cash out at just $2, and they send your money with Paypal. Very cool, no?
Since then, they've added a new feature to the site! Previously, the purpose of "coins'' was that you could save them up as long as you wanted and exchange them for more tickets in the daily $50 drawing. Now they've added a $2 drawing every 4 hours, and you use your coins to place entries in that drawing. You do this manually, and you can enter some or all of your coins (which you can still save up for as long as you want!)
I think this is a huge improvement to the site; you can have a much higher chance of winning the $2 drawing because it must be entered manually, so you can wait until very few people have entered, then dump all your coins. There's even a meter that tells you if a lot of coins have been entered (so if you wait until the meter is close to green, you will have a higher chance of winning!)
I haven't won any of the drawings yet, but I was able to cash out $10 just from the survey prizes, and I am still earning. You can even write your own surveys and other users will answer them!