We're doing more and more work in Silverlight and are part of the Microsoft Early Adopter program for this product. I think we're only just scratching the surface especially when you start to layer .NET functionality on top.
While talking to a potential client yesterday they mentioned a new search engine which is built using Silverlight and Live Search. It's called Tafiti.
It has a really great user interface and some cool functionality like saving search results. Don't know if it will replace Google as my default search engine but it does look good.
Tags: Silverlight, Tafiti