Just read about the Silverlight Flickr client (see above) that Microsoft’s Jimmy Schementi build for a talk to .NET developers there. The interesting thing is that he used IronRuby (his language of choice) instead of the C# or VB that we normally associate with the .NET Framework.
You can read what Jimmy has to say about this demo web app on his blog: Walk-through: Silverlight Flickr Client in IronRuby
And, the Silverlight Flickr Client itself can be checked out at: http://jimmy.schementi.com/silverlight/photoviewer/
Jimmy notes in his blog that it works fine in Firefox on a Mac but not in Safari.