Microsoft just launched a new Silverlight-based search tool built on top of Live Search engine:
What is Tafiti?
Tafiti, which means "do research" in Swahili, is an experimental search front-end from Microsoft, 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. Tafiti uses both Microsoft Silverlight and Live Search to explore the intersection of richer experiences on the Web and the increasing specialization of search. (source: Tafiti FAQ)
That's exciting, cool and fun!
You can also find a really good overview of Tafiti on LiveSide and a first look video on Channel 10