The source code for www.tafiti.com is available!
What is Tafiti? It is a search visualization website which brings a new user experience to researching (searching and storing results). It was originally created by Microsoft to demonstrate Silverlight and the Windows Live Search APIs.
Today the Windows Live Platform team announced the release of the Tafiti Search Visualization source code to CodePlex which means any developer can download, modify, and resell the code (see MS-PL License for all the details).
Tafiti has been released as a Windows Live Quick Application via CodePlex, which is a set of demos developers can download and use as reference implementations or starter kits for the Windows Live Platform.