Please Rob Me
A site which aims to highlight the dangers of geo-location tagging on services like Twitter and Foursquare by listing in near real-time, the people whose homes are empty.
http://pleaserobme.com

Putting Weird Things in Coffee
An enthusiastic coffee drinker who has tired of sugar and milk has taken to putting things like eggs, curry, creamed cheese and cake in his daily mug. Bleurgh.
http://puttingweirdthingsincoffee.com

Flattr
An innovative idea from one of the creators of The Pirate Bay which offers a solution for online media, bloggers, viral video creators and anyone who creates content for the web to get paid from it.
http://flattr.com/beta/