So the WPF/E moniker is gone and Silverlight is unveiled. Microsoft will be launching a new Silverlight community April 30th. In the meantime you can get more on the WPF/E stack here. Good job guys on the name - exciting and clean!
Take a look at Soma's post on Expression availability for MSDN premium customers. We'll all keep our fingers crossed that Microsoft will announce Silverlight's inclusion in Expression Blend (or Web) at Mix '07.