SteamPipe TF2 beta live. Right click TF2, go to properties, click betas, opt into steampipe to do it. A word of warning: I would suggest you wait till Monday to do it. I plan to do it Monday as that way I won't have to download as much when EVERYONE is downloading it, and the reason I'm waiting is because you can't join normal servers with it and it's not possible(?) currently to opt out correctly. There IS one server that some people join which is the SPUF server though if you want to check it out early.