BizTalk Server 2006 has RTM'd today ... best BizTalk ever, shipped on time and a very high quality server product. See the announcement here.
Of course, my favorite BT'06 features are are WSS Adapter, BAS and BAM ... because my colleagues and I worked on many of these features ... ;-)
I've been working in BizTalk team for 4 years now, this is my second BizTalk release, and I really like the things that I do here. The product and the people are great, there are MANY great opportunities, the mix of technologies that we use or develop is exciting and challenging. This is one of the best places to be at Microsoft. If you are interested, check this post on how to get your resume posted and join the team http://blogs.msdn.com/biztalk_server_team_blog/archive/2006/03/21/556067.aspxNormally, I would get borred working on the same product for 4 years, but that was not the case with this product. I decided to stay with the BizTalk team and work on the next version of BizTalk that should be even better. However, I will change teams inside BizTalk, I am moving to the engine/message box team. I have admired the work they've done for quite a while now and that seems to be the right place for me going forward.
If you haven't done this already, take a look at the latest BizTalk release here http://www.microsoft.com/biztalk/default.mspx