We had a client incident where there was an issue with the BizTalk WSE adapter that was resolved by the BizTalk WSE Apadter Service Pack 1. The comment from someone on the product team was that not many people seemed to know about this service pack, even though it had been available for some time.
So, there you go, I've done my bit to get the word out :)
http://www.microsoft.com/biztalk/evaluation/adapter/adapters/wse/default.mspx