ItsMods

http://en.wikipedia.org/wiki/Team_Foundation_Server

They are developping a new web based service (which also integrates into Visual Studio.

Register here http://tfspreview.com/ and enter almsummit as invitational code.

Saw ads of it 2 years ago already, still pretty cool to use it one time I think

we're running TFS in the company for over a year now and it's great indeed

I like how this thread has a [Release] tag

Yes, but you need an invitational code to get an account there and I posted a code in the first post.