Imagine Live Search - Microsoft's Test Site Launches by Barry Schwartz, Search engine land (May 17)
Imagine - Live.com, itself a new interface, has an experimentatl one too. "Like those from Ask (Ask X), Google (SearchMash) and Yahoo (Alpha), it provides a mixture of results all on the same page. "
Imagine Live Search: http://search.imagine-live.com/
See article for comparisons and screen shots.