Microsoft have just made a beta of Tafiti available http://www.tafiti.com/ - an experimental search engine based on Silverlight - Microsoft's attempt at a Flash type product. The faq's say it's "designed to help people use the Web for research projects that span multiple search queries and sessions by helping visualize, store, and share research results"
As you can see from this screen shot, for once, it's a search engine that, for once, looks nothing like Google. Instead Microsoft have used Silverlight to provide a rich, desktop like search application. Underneath it's still powered by Microsoft's Live search (personally I don't really get on with this, but I know some people like it).
I generally loath sites that are developed in Flash (slow loading, non-standard interfaces etc), and I guess this should be no different, but it does actually feel like there is a point to it. It does seem to suffer from the over-designed interface that MS seems to be using since Vista, but it's still an interesting example of what the web could like like if we moved on from HTML etc.