Last night, Jan 19th, I attended the Atlanta Drupal User Group (ADUG), http://www.drupalatlanta.com/,  with Glen Gordon.  The talk, presented by Steve Jaffe of IBM, was about “Integrating Flash with your Drupal Project”.  Steve did a great job of how Drupal can be used as the backend for Flash.  Never having used Drupal, the same techniques presented can be use for connect to Silverlight.  In fact, after some digging around, it looks like someone has already been playing around with Drupal and Silverlight…Matt Serbinski.  Here are a couple of his articles:

• Connecting Drupal and Silverlight by Matt Serbinski
• Silverlight and Drupal: Syndication