6.0.0.M3 version of JBoss AS has just been released. You can find the release notes here and you can download the server from the JBoss AS downloads page
This release in addition to bug fixes and other new features, includes support for EJB3.1 Singleton beans. You can find the details and an example here. So it's time to try out this new feature and report any issues in our EJB3 user forums here!
Ofcourse, any JBoss AS specific issues can be discussed in the JBoss AS user forum.