Over the past year, I've gotten lots of questions from the ISVs I work with about how to integrate SharePoint with Silverlight.  "I dunno - give it a try and let me know how it works out" quickly became a tiresome response, some I'm pleased to let you all know that we've recently announced the Silverlight Blueprint for SharePoint.

http://msdn2.microsoft.com/en-us/sharepoint/cc303301.aspx

While this shouldn't be interpreted as a statement of official product direction for future releases, it's nice to have some guidance out there to help get started.  The link above will point you out to http://www.ssblueprints.net/sharepoint/, which now contains:

"Six application component samples are included in the kit to get you started:

  • A simple “hello, world” sample showing Silverlight in a Web part.
  • A Silverlight slider control as a SharePoint custom field type.
  • A navigation control.
  • A Colleague Viewer that uses lookups in Active Directory by using Windows Communication Foundation.
  • A Silverlight picture viewer from a SharePoint picture library.
  • A visual how-to center, created in Silverlight and based on a SharePoint list, for viewing videos."

Definitely worth checking out for those so inclined.

I have the good fortune to be working on a proof of concept effort that will include these technologies, so I'll post on this more if warranted.