I posted a build of the WPF Feature Montage that works with RC1. This is a great demo that walks through all the features of WPF in an amusing way, first delivered by Fil Fortes at MIX06. He uses lots of clever techniques that are worth pilfering. Also very useful to show someone (like your boss) what this WPF thing can do.
I also updated the two .xbaps (Cube Animation and Monkeys Jumping) up on the http://wpf.netfx3.com site for RC1.