I have the same problem. Did you find a solution ?
Not that this helps but what they usually recommend is re-running seam-gen. My seam-gen generated the following entries in jndi.properties
That's what I already have in my jndi.properties file.
I think I solved my problem by adding jboss-embedded-beta3.jar to my classpath. But I am not sure the problem is really over because I now have a problem with unknown dsType on server startup.