...to point people to if someone wanted to learn WPF?
Ooh, tough one! Let me find a few links once I'm at work (eating breaky at home right now!) and I'll post here again.
What sort of programming experience do you have, John? Are you coming from a .NET background?
Ok, in terms of reading material, this is the pick of the books out there: Windows Presentation Foundation Unleashed.
For blogs, there are a lot of blogs and articles on WindowsClient.net, and there's an excellent blog all about data binding in WPF by Beatriz Costa. Also take a look at LearnWPF.com and Ask Dr. WPF.