Paid to play

http://www.exodus3000.com

Exodus 3000 is an online strategy game. Members earn Mars Dollars (MD) for performing actions in the game, such as mining volcanos, searching ruins, and attacking other players. At the end of the month, you can exchange your MD for real cash :)
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http://www.weblo.com
Weblo.com is a virtual copy of the real world. Members create relevant pages on their favorite people, places and things and earn money when people visit them.

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https://club.live.com/get_prizes.aspx

Join the Live Search Club and get rewarded for playing games. Members earn tickets by playing a variety of trivia & word games such as Flexicon, Clink, Chicktionary & CrossWire.

Tickets can be exchanged for prizes such as ringtones, songs, t-shirts, headphones, usb drives, videogames, movie tickets and more. Prizes can only be delivered to valid U.S. addresses.

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http://www.gamesville.com

Play free online games, inluding bingo & casino games, card games, puzzles and word games, for a chance to win cash and other prizes. Participate in cash competitions with other members for a chance to win more money. Any registered member (18 or older) from anywhere around the world is eligible to receive prizes.