If you are a .NET developer, you can reuse the core visual photo browser at the heart of PhotoMesa in your application.  We offer a standard .NET Control with a well-defined public API.  You put it in your application, add images and groups to the control, and immediately get the complete rich PhotoMesa interaction - fast zooming, scrolling, navigation, grouping, representative photo mode, favorites, hidden photos, etc. There is no easier or cheaper way to add rich image browsing support to your .NET application. If you're interested, send us email.