jboss 3 and 4 currently support jca 1. I don't know of a cts so I can claim full support;-) At least I don't know of anything I missed... periodically people find things though.
I'm working on jca 1.5 support, I have transaction inflow, work, and most of message inflow done, so I think deployment is the main other part. Do you have a jca 1.5 adapter? Maybe you could help test it?
I don't have one yet. But I'll definitely volunteer it for testing once it's up. Sounds like fun!