Thanks, Jesper. I'll look into that and see if that works any better for me.
Is there any chance that you (or anyone else) can confirm that sun-jms-adapter.rar is the wrong choice for JBoss 7? Or is it still possible that that's what I'll end up needing? At the moment, it's hard to tell if it's not working because I'm doing something dumb or if it's because it's incompatible with JBoss 7.