We are very happy to announce that SilverlightShow Bookshelf has been just released as Open Source on CodePlex. We now call it Classified Cabinet as it's a more generic control that can be used in various scenarios.
Short description: The Silverlight Classified Cabinet is a component that makes it easier to show classified items in a nice way. With the power of Silverlight, it lets users zoom and drag the items, categorize them into shelves, filter and see detailed view.
See an article that will help you start using this control (more articles coming soon): ClassifiedCabinet: A Quick Start
Check the ClassifiedCabinet on Codeplex | See live demo