I posted up a blog entry on this. I was going to post the code here but I can't quite get the forum to recognize the stuff I want it to recognize.
Anyway, here's a link to the blog entry showing an RSS feed consumer that consumes the feeds using XLinq and then binds the strongly-typed, business-class-contained data to WPF via the ObjectDataSource.
The .NET Addict's Blog.

Combining LINQ query power with WPF