Mattias Skarin aka Crisp posted a nice small article with a case study about a team that is transformed from Scrum to Kanban.  He also put a few things he learned from this process, but also mentioned that they still have a way to go.

So if you are interested in this, read it here: http://blog.crisp.se/mattiasskarin/2010/04/27/1272362964756.html