If you haven’t already done so – please consider moving your development and live servers to BizTalk Server 2004 SP1 wherever possible.

It does really make a difference to common scenarios; it helped us out in the Scalability Lab recently with regard to SQL Server deadlocking under high load and also fixes a tricky bug whereby if your were using the SOAP adapter via dynamic ports you were prevented from moving the Adapter into another host to avoid the thread starvation problems.

It also introduced a few new handy performance counters as listed in the Readme (which we all read don’t we J), most notable are the new counters for the Messaging engine giving you a bit more “view” into the plumbing.

There’s plenty of other fixes listed here