I found a link to this one on the Visual Studio Team System home page. If you enjoy the application blocks created by the patterns & practices group (their page, oddly enough, doesn't have the link), you'll love the Logidex .NET Library.
MSDN Lab - Logidex .NET Library
LogicLibrary Logidex is a software development asset (SDA) management solution that provides enterprise application development teams with powerful search functionality, collaboration tools, metrics, and access to .NET assets. For read-only access to the MSDN Logidex .NET Library - which allows you to search for and download .NET SDAs - you can use either Internet Explorer or an add-in for Visual Studio .NET.