Here's a really neat SilverLight based game - www.ltbennett.com

Check out more details on Tim's Blog

so what is it?  well, Zero Gravity is a game and involves our absent-minded astronaut, lt. bennett, who continues to crash his ship into an asteroid.  your objective?  help lt. bennett find his way back to his ship in each level through various mazes.  there are different types of levels and different types of obstacles involving teleports, asteroids, ice blocks, pipes, etc.  once you get lt. bennett back to his ship, you advance.  your score is based on time and moves.

Link to Zero Gravity