I don’t know much about the Business Intelligence stuff and I know less about BizTalk so I don’t know much about this new document from MS:
“The purpose of this guide is to provide guidance for using Microsoft BizTalk Server 2009 with Microsoft Windows Server 2008 Hyper-V. The emphasis is on BizTalk Server, but the performance evaluation methods and performance testing scenarios are useful for analyzing the performance of virtualized server applications in general. This guidance will be of interest to both the IT Pro and Developer communities”.