For general feedback about the game.Steam Support
Visit the support site for any issues you may be having with the game or Steam.
One of the things we hope to do on this blog is to point out the creative things that members of the TF2 community are up to. The Steampowered TF2 forum members have been collecting links ever since TF2 was released, and you can take a look at the list (and its accompanying 46-pages-so-far (!) forum thread) here.
Recently, we've received a ton of email asking us if we had accidentally leaked the details of the Spy's unlockables, after Kaanin created this fake web page detailing his version of what the release should contain. His mocked-up image was convincing enough that even some of us at Valve were momentarily fooled. Well played, Kaanin.