Are you combining rails with python for hardcore networking, scala lift for procedural code, assembly and C deep down on the server to get what you want?  Let's hear about it.

Python underlying for the application tier, price matching etc, 4suite for XML and EDI, Rails sits on top for higher level application abstraction and UI via Webservices back to the core. This is for a bespoke bit of consultancy that we have done for a financial service provider.