For teenagers - ages 13 to 18
Hundreds of cool games!

MIT-sponsored free science summer camp for high school juniors and seniors (RSI)

actionquest.com -- international sailing summer camps for teenagers

Going to the moon (Greenfoot game) -- tutorial

Science fair project ideas -- sciencebuddies.org (8 million users)

Hackety hack for teaching children programming

Make a game with Pygame -- beginners tutorial -- Python

Using Alice to teach programming to middle school girls -- Alice for story telling

Scratch Book: Scratch Programming for Teens

Professor David Malan at Harvard explains computer programming with scratch

learnscratch.org -- video tutorials for programming scratch (scratch.mit.edu)

Super Smash Bros

Super Mario

Bloxorz - fun online game for kids

Pokemon