Today I found out there is a new magazine for BizTalk. Thanks to a site called BizTalk 24 * 7 from Saravana Kumar. Great site I can recommend it if you want to find more BizTalk resources and so on. It out for a couple of weeks now and can be downloaded here. There some posting out there from a number of people like Bundy's .NET and BizTalk Server Blog, Tim Rayburn and Saravana himself. Have a look for yourself at BizTalk 24 * 7, if you haven't already. I am going to read the magazine now. Keep you all posted.
BizTalk Server
BizTalk 24*7
BizTalk Hotrod 
BizTalk ResourcesLabels: BizTalk Server 2006