Mike is looking at LINQ
Mike Taulty's blog - he's a colleague of mine here in Reading - has a load of great content.
Very recently there's a great post on his adventures with LINQ as he begins to get to grips with the tech. I have to say that I really like using LINQ but I haven't tried to intellectually understand how it works. Just so long as it does, that's fine by me.
Also worth looking at is a great WF and WPF demo, though to be honest there are many great examples and posts covering lots of .NET3.0 and Vista tech.