Looking to have a little bit of fun on the internet, but don't know where to look?

Hunkin's Experiments
Planet Jemma
The Tomato Zone
Cabaret Mechanical Theatre
Enginuity
TryScience - New York Hall of Science
Science Inside Out
Science + Engineering
Bubble Town
Discover Engineering
Great Achievements
How Stuff Works Building Big
Chem4kids
Funbrain
Brain Food
Discovery School
Simple Machines
Reeko's Mad Scientist Lab
Potential Energy
Design a Roller Coaster
Tiki the Penguin's Guides
Seeing, Hearing and Smelling
Discovery's Yucky Kids
Science Wire
Do Science
Adventures of Science Bob
Science Watzit
Science in Space with NASA
Exploratorium
NOISEmakers