Hi, My company's applications are based on Oracle databases and Oracle Forms. I've built a prototype application using a Flex front-end and Ruby-on-Rails back-end. And although it works great, my boss is afraid of customers' potential reactions to Ruby-on-Rails and the whole Ruby + Rails + (other gems) + Mongrel + nginx/Apache stack.
So I've been asked to explore an Oracle-only back-end alternative. I haven't had a chance to experiment yet, but I've heard of OHS (Oracle HTTP Server) and EPG (Embedded PL/SQL Gateway) which enable you to communicate with your Flex front-end via XML, for example. If you get a chance to try this out, let me know; I'm eventually going to have to do this (if I can spare a few days...). Good luck, Chris.

