Microsoft ESB as a toolkit
Sorry it took me a while to notice, but Microsoft released their first CTP of the ESB Guidance toolkit on Codeplex in May. If you are interested in Enterprise Services Bus, or message brokers in general, I recommend this link.
http://www.codeplex.com/esb
I've downloaded it and will start looking to see if the connected services team have finally delivered an ESB for Microsoft customers.
