ActionScript Physics Engine

I was searching around looking for something to do my blog on and I came across this amazing physics engine.

http://www.cove.org/ape/

This engine was created by Alec Cove and its a great example of how powerful ActionScript really is. Here's a few examples that are pretty awesome.

http://www.cove.org/flade/demos/demo1.htm
http://www.cove.org/ape/demo2.htm
http://www.cove.org/flade/demos/demo3.htm

The coolest part of this is that it's all open source. You can download a zip file that has all the individual scripts for each part of the program, such as collision detection, wheels, particles, etc. With it being open source, you can use the code right into your games and make some pretty amazing games.