Chess

This is kind of cool. It can be hard to see, so you may want to click on the full screen link.

Get the code here.

See also Chess.com.

Space Invaders!

Wow, this brings back a lot of memories. I wonder what percentage of my youth was wasted playing this game.

Strategy hint: Try focusing on the space invaders at the edges. If you can eliminate entire columns, then it will take the invaders longer to go from side to side. This will prevent them from progressing down the screen at you as quickly. (They move down a bit after each side to side movement.)

You can get the code for this gadget here.

See also the Wikipedia article about Space Invaders.