Well, I haven't spend time on application server integration lately, as my application is neither a web-app nor so complex that it doesn't work with a standalone application context...
And while I couldn't get it to work on JBoss AS 6, I'm wondering if maybe JBoss AS 7 would be an option for you? Marius' latest blog post suggests that Spring applications work very well on it.
http://community.jboss.org/blogs/mariusb/2011/07/13/spring-and-jboss-as7-part-1-getting-started
All the best
Marcus