Update: I posted the code for this extension in a new entry
Vertigo has created a Silverlight based Slide Show control open to the public. I decided to try and create an extension for BlogEngine.NET to use the control in my blog. However the approach used at http://blogs.msdn.com/mswanson/archive/2007/12/18/silverlight-slide-show.aspx is a lot easier to implement. I was able to get an extension to work though. The biggest problem I ran into was getting the correct URLs for the configuration and data files. If you have Silverlight installed you should see a working example below.
If there is any interest I will post the code for the extension.