This just came to my attention via Lifehacker.
The first (that I know of) Passive Multiplayer Online Game. You play by browsing the web. It’s implemented as a Firefox extension and a website. You install the extension to get the toolbar and you earn points by browsing the web. You can do missions ("guided online tours"), go through portals ("blind links that may be helpful or a distraction"), and spend your points to buy presents or traps which you leave on sites for other PMOG players. You level up and earn achievements ("badges"). Description and good explanation video on the link:
