A blogger named Autumn has a great blog on this subject at http://autumnxbutterfly.savingadvice.com/2007/01/06/money-online_20042/.

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Someone else posted a blog about online stuff they do for pay. I have surveys sites that pay me or enter me into contents to win money. I don't make very much money from these sites, but I do make enough that once in awhile, I am able to put a little extra towards the credit card debt. Hope this helps you all out in your $20 Challenge or just putting a little extra jingle in your pocket. I always stay away from the ones that demand my home phone number, as survey people can be worse than telemarketers about calling in the middle of dinner with seemingly endless surveys.

E-poll
http://www.epoll.com/epoll/clients/logout.htm
At E-poll, you can get gift certificates, gift cards, movies passes, etc. No cash as far as I know.

Opinion Outpost
https://www.opinionoutpost.com/index.php
You can get cash from Opinion Outpost and filling out enough surveys.

Ad Paid
http://adpaid.com/ptr/pages/index.php
Look at advertising online and when you accumulate a certain number of "clicks," you can redeem your clicks for cash.

Lightspeed Panel
http://us.lightspeedpanel.com
Lightspeed Panel is a survey site that surveys members about all sorts of topics. After collecting points, you can redeem your points for cash, gift cards, merchandise, and music downloads.

National Family Opinion
http://www.mysurvey.com/
NFO is another survey site where you collect points for doing surveys and redeem those points for cash, gift cards, merchandise, etc.

Harris Poll
http://www.harrispollonline.com/
Harris Poll Online is a survey site where you collect points and redeem them for merchandise. I have yet to see cash offered, but I could be wrong. I got a really cool case for my laptop from this place.