Robert and I just got posted to MSDN TV. We do a talk on the Power of Templates in Windows Presentation Foundation.
If you want to look at my sample (the folder picker), just download my Bag-o-Tricks. It's one of the samples in there.
If you want to download Robby's sample, please be patient. He's at home taking care of a new baby. I think he's in the office next week.
Link to the transcript (because some people think I talk fast): http://msdn.microsoft.com/msdntv/transcripts/20060202WPFKMTranscript.aspx