Darren keeps on chipping away at the BizTalk Coalface
No, the BizTalk Coalface isn't a VS Add-in, it's just a euphemism. Darren Jefford is an App Dev Consultant at Microsoft UK and he's been working at the sharp end with BizTalk 2004 over the last few weeks. Check out his blog here.
His most recent post shows how to implement orchestration-based preprocessing on all messages coming into a specific port - something that strikes me as particularly useful.