In the last few days I've received quite a few visitors (over 3000 in the last three days) through "Stumble Upon", a web2.0 style site sharing/search engine. Since then I've installed the program and tried it out, and I really like it. Through Stumble Upon you can find sites via user recommendations. The users find really interesting sites that you would never come across by using regular search engines.
Click this link
if you'd like to find out more.