The other day I posted a video showing how to use the Pulse Particle system in Flash. Now, here's an introduction on how to use some of the particle explorer functions to define particle behavior.
Explorer introduction - Part 1
Explorer introduction - Part 2
You can find the Pulse Particle project page here:
http://rogue-development.com/pulseParticles.html
There were several requests in my last blog post on how people could help out. Check out the new contribute page on my site. There things for all levels of technical knowhow there.