RippleRock are one of our closest partners in the UK when it comes to facilitating Agile practices with Team Foundation Server. Colin Bird is the founder of RippleRock but formerly, as Conchango's CTO, he was responsible for their Agile consulting services and tools, including Scrum for Team System.
Colin has written a very interesting blog post on configuring Team Foundation Server 2012 and Visual Studio Scrum v2.0 to support multiple teams which you can check out here
Richard