DreamCatcher Games is accepting applications for its Painkiller Multiplayer Test. This is not a public demo - but a closed beta to try out the net code and playtest maps. Interested gamers should fill out the application form. The company will be selecting a team of 200 over the next few weeks. The testing itself will take place in mid-October.
News source: The Adrenaline Vault
View: Application form
View: Official website