Aaron Skonnard titles a pair of MSDN columns he has written "An XML Guru's Guide to BizTalk".  I make no qualms about ripping his ideas off and sharing them with my customers to describe why a .NET Development group could benefit from using BizTalk Server as part of their application platform.  This could be for a single developer, or a group of developers.  For just one example, removing a portion of your testing and interface routines from code and moving it into BizTalk may seem like overkill at first, but if you do take a couple of minutes to digest his columns and watch the webcast, you won't be able to avoid thinking that I'm either a fool, or Aaron might be onto something.  (Or both). 

An XML Guru’s Guide to BizTalk: Part 1

An XML Guru’s Guide to BizTalk: Part 2

An XML Guru’s Guide to BizTalk: Recorded webcast