Microsoft Developer Network
Microsoft® .NET Pet Shop is a series of application benchmarks comparing the performance and scalability of this .NET Web application to the performance of an equivalent, revised, and fully optimized J2EE™ application developed by the Middleware Company.
For more information and downloads
Microsoft .NET Pet Shop 4.0
Microsoft .NET Pet Shop 3.0
Microsoft .NET Pet Shop 2.0
For an overview of a variety of .NET samples, see Microsoft .NET Architectural Sample Applications.