Guidance for Running Biztalk Server 2009 on Hyper-V
A new guide has been released on April 17th that provides information on using BizTalk Server 2009 in a Hyper-V environment. You can download it in a variety of formats from here.
The emphasis of this guidance is On BizTalk server, but the guide provides great information regarding performance evaluation and testing scenarios that are applicable across other workloads too. Check it out!