StumbleUpon

This site is for those *free* moments you get at work or home when you got nothing important to do except surf around the web. Well, there couldn't be a more excellent alternative to installing the StumbleUpon toolbar. All you gotta do is sign-up on their site and choose your Interests (more like the kind of sites you'd love to visit in free time) - popular choices include online games, quizzes, optical illusions and the like.

Once installed, it sits nicely there below the address bar and once you're free, you click on the "Stumble" button to start stumbling and visiting random and cool sites in the process :). I've found some great sites using this service and I recommend you try it out!

Happy Surfing!