This seems to be very hit and miss.
Spend over an hour in game, but actually only drove 2 laps.
In game chat without a mic seems really awkward with GFWL and I'm not sure my mic was working.
I have a ten slot Teamspeak 3 server, hosted by Multiplay, that basically me and a mate use for co op games.
I don't mind anyone else using it for sorting out F1 races and in game chat, because as it is there's a lot of hanging around and very little racing going on.
The IP address is 85.236.100.27 Port 16847
Download the TeamSpeak 3 client for your OS here
http://www.teamspeak.com/?page=downloads
You can get the password by emailing my trust or add me to Steam, GFWL, Xfire or Raptr and sent me a chat message.
My Steam, GFWL and Xfire ID are all the same barmyllama
Raptr ID is Barmyllama
I only really use TS3 on Tuesdays, Thursdays and Sunday evenings, so please don't be offended if someone gets kicked for me and my mate to use.