The DPE Architecture Strategy team released the first-ever SaaS architecture guidance/sample application on our platform . The guidance and the sample is based on a HR scenario. Architected as a single instance multi tenant solution, this application embodies many of the architecture principles published in our whitepapers

http://msdn2.microsoft.com/en-us/library/aa479069.aspx ;  http://msdn2.microsoft.com/en-us/library/aa479086.aspx and show how Microsoft technologies can be used for successfully building SaaS solutions.

Repository of the code and related documentation (including webcasts) on our Architecture Center on MSDN:

http://msdn.microsoft.com/architecture/saas/sampleApp

Community site where architects and developers can discuss in forums, report bugs, suggest and vote on new features, contribute code:

http://www.codeplex.com/litwareHR

 -Suresh