There's a Wiki entry here: http://en.wikipedia.org/wiki/Physics_card

Then a Toms Hardware article here: http://www.tomshardware.com/2006/07/...physx_failing/

And a HotHardWare review here: http://www.hothardware.com/viewartic...leid=816&cid=2

Doesn't look ready for prime-time to me right now - I'll pass.