Windows Desktop Search, which is installed with MSN Search Toolbar, will find anything on your computer ; e-mail messages, calendar appointments, photos, documents, and more. Searching your computer is as fast and easy as searching the Web, and the Desktop Search results window includes rich Windows Explorer features, such as multi-select, right-click, and drag-and-drop functionality.
Windows Desktop Search can be extended to index the contents of new file types and data sources. The user interface can be extended by associating icons and context-menu handlers with those items.
Also, queries can be passed into the Windows Desktop Search application and returned so that other applications can display the result sets from within the application.
This document explains these beta extensibility options and their implementation.
The first things that pop-up was Groove. It would be really great to be able to search accross all groove workspaces to find documents, discussions entries, pictures… I think that Groove would be a fantastic new data source.
The only problem is that you need to implement the data source in C++, back to the roots.