Hmm I thought Punkbuster stopped development a few months back because of a lack of co-operation from Valve? Maybe they have started up again

Either way there are quite a few other anti-cheat programs out there, Paladin, CSGuard, and they all make a difference, but it's a vicious circle really, the cheats always seem to be able to find a way round them.

The worst thing I think is the paranoia all these cheats bring, you can get two head shots in a row without being called a cheat