Yusuf Mehdi demonstrated Bing's new Silverlight powered Visual Search experience yesterday. Using Visual Search you can use images as keywords to search the Web. Visual Search allows you to quickly scroll through the gallery content or do a one-click refinement using the quick tabs on the left, which are specifically relevant to the type of results you are browsing through.
Visual Search is a Silverlight application, as Silverlight allows fast manipulation of the large data sets that hold the information of each gallery and also a compelling visual presentation of the data.
Enjoy the Visual Search here. For more information visit the Bing Blog.