If you haven't heard of it before - StumbleUpon is a website used to discover web sites based on your interests.
When you register (free) you list your interests. You get a nifty lil button added to your toolbar and whenever you want, simply click the Stumble button to be taken to a random website that matches the interests chosen.
I have found so many interesting websites this way.
Check it out - very easy - very cool - works for me!