Stumble Upon & Other Sites

I found the following places that are pretty cool :

First, StumbleUpon, I guess you'd call this a search engine that looks for just the stuff you want, but it does it randomly. Say you set the preferences for antiques, web design, and web artists. Each time you click, a random site from just those topics appears.
Warning ! This thing will waste a lot of your time, it's absolutely wonderful.

These two sites came from just such a session :

Web Sketch

The image on the page was created with :