Click here to go to the sign up for cash surfers.
How it works: Cash Surfers offers points for the amount of hours you spend online, and at the end of the month, those points are converted to cash. The best part about it, the hours are unlimited.
Click here to go to the sign up for all advantage
How it works: All Advantage will give you 50 cents for every hour you are on the internet, up to 25 hours. This is suppose to change to 40 hours sometime soon, however. This is by far the most popular, and it is the one that started it all.