Microsoft just published a very interesting an in-depth 86-page document about BAM, one of the most under-used features of BizTalk Server, “Business Activity Monitoring in Depth for Developers”. You can download if here, and find more overview info about it here. Highly recommended.
Additionally, if you have been following the new features of BizTalk Server 2009, you can find the beta documentation available for download, which is well worth a look. Better yet would be trying out the public beta, which was made available in December, and is available at Microsoft Connect.
Finally, on a last note, I’ll be doing an overview session on BizTalk Server 2009 at Microsoft DevDays 09, which this year will happen at Instituto Superior Técnico on the 18th and 19th of February. Be there if you are interested in the product.