I know I focus on WCF, WF, and Infocard, but for demos I also use Windows Presentation Foundation (WPF).
I'm guessing some of you may do this as well (WPF rocks!), and maybe had some challenges migrating older XAML files to the FebCTP build.
If this is you, you're going to like this. I just ran across a utility that Rob Relyea built to help with the migration to FebCTP.
You can be find it here:
http://www.longhornblogs.com/rrelyea/archive/2006/02/14/XamlMigrator.aspx