One of the coolest thing I saw at MIX was a useful example of Silverlight’s Deep Zoom technology on Hard Rock’s Memorabilia site: http://memorabilia.hardrock.com/
You can see a demo video of this: http://www.visitmix.com/blogs/Joshua/Hard-Rock-Cafe/
(If you want to create your own Deep Zoom content, you can use an app that I and a few others worked on: http://blogs.msdn.com/expression/archive/2008/03/05/download-the-preview-of-the-deep-zoom-composer.aspx)
(This uses the same technology found in PhotoSynth that was mentioned in this site before)
