Air Bag basics? Where to read up?

[FirstGen]

I am considering air bags. Is there a good site to read up on the basic's and pro/cons. I'm interested in all aspects like how they work or the lack of in road racing/drag racing/towing/cruising/etc... I would definatly want as compact and light of a kit as possible. I am not concerned with quick pnuematics. If it takes 5 minutes to change ride height etc that is fine if I can get around having a large air tank or any on board air tank at all...

Thanks in advance...