BisTalk Server 2006 Released Today!
You probably know this already. You can find an overview of BizTalk Server 2006 features here.
Now that BizTalk 2006 is released, I can speak a little more freely about the product. You can use the "Contact" link to suggest topics you'd like me to shed some light on. I do not promise I'll be able to answer every single question, but I'll do my best.