A friend from my previous team was asking about some resources relating to WPF as his team will be ramping up for WPF/Silverlight in their future releases. I think that's awesome and quite a shift in paradigm (COM/Win32 => .NET/WPF/Silverlight). Anyway, I thought I'd share some information on learning WPF here. Also, here is some faq information regarding Silverlight and Windows Mobile.
Windows Presentation Foundation Unleashed by Adam Nathan: Probably the most popular of all the current WPF books out there right now. It is a great book and one of the best introductions to WPF.
Programming WPF by Chris Sells and Ian Griffiths: Also a good and easy read. Good intro and goes a little more in depth than WPF Unleashed.
Pro WPF in C# 2008 by Matthew MacDonald: I would say that it's not the best intro book as it is huge, but it has a ton of useful information and examples and goes in depth in a lot of topics. I find myself going to this book a lot for reference.
http://www.codeproject.com/KB/WPF/: Lots and lots of samples and tutorials. This is one of my favorite one resources for tutorials.
http://windowsclient.net/default.aspx: Our official public home.
Check out Tim Sneath's blog roll which has a pretty comprehensive reference to WPF, Silverlight, and Blend blogs.
If anyone else knows of additional resource material that people would find helpful please let me know.