WPF/E == Silverlight
If you haven’t already heard about Microsoft’s new high fidelity, cross-platform application development platform, you just haven’t been paying attention. Silverlight is the new name for WPF/E (although it’s still XAML-based) and does some *amazing* things.
And, if you can wait just a little while longer, you can read about Silverlight in Programming WPF (available now in Rough Cut format and for pre-order from Amazon) in an appendix by my friend and yours, Shawn Wildermuth. Shawn’s been doing a ton of Silverlight work lately, including doing a bunch of Silverlight presentations for Microsoft, so he knows of what he speaks.