WPF + XNA = Love

Looks like a dream come true. It seems that at some point we will be able to use WPF for UI, with XNA for the game engine.

You can actually already do this in an "unofficial" manner, according to some folks over at Stack Overflow.

Throwing in the Towel

You've probably noticed that the blog hasn't been updated in a while. WPF performance just doesn't seem to be there for serious games, and I've thrown in the towel and will work on games using XNA. I just don't think it's worth fighting the WPF framework...

Alternatively, you may find Unity rather useful. :)