Doing a new Modern UI/Metro style UI to our application, recently I’ve been fortunate enough to begin working in WPF.
To get a quick overview of XAML, I found these IMO rather good tutorials:

http://www.youtube.com/watch?v=0qE5hyuU9hE&feature=g-hist

http://www.youtube.com/watch?v=qPDNgN2mEeA

As of yet, I haven’t had time to watch the rest in the series, but I would guess that, if one would need more explanation, it would be worth watching them.

As always, feel free to comment, or ask.