I've been spending my free time in the evenings going through Stephen Walther's book ASP .NET 3.5 UNLEASHED and I am quite impressed.  This has been the most informative resource on the .NET 3.5 framework that I've come across yet.  Searching on the Internet is great for finding those "one-off" solutions, but when it comes down to it, you need to know the tools that are available to you.  This book has it covered!  I'm excited to continue working my way through it.