On August 13, 2012, Brian Harry announced that the Team Foundation Service (TFS in the Cloud) now has support for Kanban boards:
Support for on-premise Team Foundation Server 2012 should come with the first update post-RTM.
Here is a video about this new feature:
For those not familiar with Kanban, which was originally created for manufacturing, you can go here for a general overview:
As for Kanban and software development, I personally like this session from TechEd 2011: