I've been having a play with Silverlight 2.0 in the last couple of days. Here's the result: a little utility to convert numbers to words based on the algorithm that I created for Project Euler 17. It's amazingly simple to get going: within minutes of completing the Silverlight install I had my C# code running inside the browser.
Hopefully I'll find time to write up a post on how I did it, and how to take advantage of the free Silverlight hosting that Microsoft offers.
Update: By popular request, the code for this utility is now available here.