I just got the MSDN in the snail mail box and was reading this morning about the new Windows Workflow Foundation (WWF). There is a strong similarity with Biztalk in regards to the Workflow part of BizTalk.
There are some other comments about this comparison. See Darren . Combine this with the news that Scott Woodgate has left the project, I wonder where the BizTalk product is heading to.
Brian Loesgen has published a nice comparison table of BizTalk features v.s. Windows Workflow Foundations.