An Office Business Application Reference Architecture Pack (RAP) for Supply Chain is now available on the OBA RAP page. The RAP for Supply Chain is a working example of an Office Business Application (OBA) built using the 2007 Office System.
OBAs connect users to services and systems via the Microsoft Office interface (see below for Atanu's architectural overview).
Javed has more info on OBAs and why you'll be seeing a lot more of them in the near future.
Word 2007 to yo motha....