Microsoft ESB Guidance at CodePlex has updated to CTP2
Overview
The Microsoft ESB Guidance provides architectural guidance, patterns, practices, and a set of BizTalk Server and .NET components to simplify the development of an Enterprise Service Bus (ESB) on the Microsoft platform and to allow Microsoft customers to extend their own messaging and integration solutions.
One pf the major changes for me is the fact that the core components have been updated to the R2 release of BizTalk Server ;)