Sean E. Russell just announced SERStomp (working name) -- a super lightweight implementation of both the server and client sides of stomp. Woot!
Also, in stomp news, the plans for improving transaction support, explicit character encoding, and message ack modes are all at least touched on in the wiki. I'll update the protocol spec as I update the ActiveMQ implementation! Sean gets credit for anything intelligent in the character encoding, I get blamed for the stupid stuff =)