I like the pages you would never think that someone would create:
Interesting Pages - for me at least
Psychology - Sensory Perception
Fun Topics
I have a game I created and can be fun to play - it's call 7 Wikis. It's based on the concept of the 7 degrees of seperation. The idea is start first choose an topic like Elevator or Toronto then click on Random Article and see how many clicks within the article it takes to get to your choosen article.