PMOG

This is a pretty fun passive online game, you install a toolbar and then get points for browsing and going to on link quests suggested by other players.

"The Nethernet (previously known as PMOG, the Passively Multiplayer Online Game) is an online game in which players "passively" participate in while browsing web pages. Players earn data points by taking missions, which they can spend on various game items that could be attached to web pages to trigger events when another player next visited that page.

The site was first developed in 2007."

http://en.wikipedia.org/wiki/Pmog

Description of PMOG
http://www.youtube.com/watch?v=RyvIBp3mlGQ