Microsofts Approaching Embedded Intelligently blog features the current version of DISMUI. 
J.T. Kimbell has written a fantastic post about the tool that also includes a demo video showing DISMUI in action.
You can read the whole blog post here: http://blogs.msdn.com/b/windows-embedded/archive/2012/05/24/dismui-an-awesome-community-created-tool.aspx
The video can be seen on Youtube here: http://www.youtube.com/watch?feature=player_embedded&v=0i86F-XClI4