For me it was Stumble Upon.
Because no one else mentioned it before, i m gonna explain what it is :
Stumble Upon (
www.stumbleupon.com) is an extension for several browsers (Firefox, IE, and some others...). When you register, you define some topics you like among the 500 topics offered (photography, video games, medieval history, war in Irak, etc...). Then you can click on the SU button in the SU toolbar, and it will get you to a website related to one of your favorite topics. The websites are proposed by others users. So they are most often very interesting.
I discovered hundreds of fun, interesting or informative website thanks to SU. It s really an original way to discover the Internet...once you start stumbling, you re hooked on the thing
