I imagine you're talking about Flexonrails. I don't know what happened
to that project, but in case it helps, I can tell you that Kaazing has a
Flash JMS client which talks to any JMS Message Broker via Kaazing
Gateway using the STOMP protocol. This is commercially available as part
of the Kaazing WebSocket Gateway product. So you could use that if it
meets your needs. Or if not, at least it shows it's possible to use
STOMP with Flash.
Chris