Make it evident that the community AS is not our supported offering.

E.g.
like the banner in the AS download page:
http://labs.jboss.com/jbossas/downloads/

and/or pointing to:
http://labs.jboss.org/projects/community-enterprise.html

Possible places:
The initial jbossas labs page
index.html within ROOT.war
release notes

SF.net downloads (if possible)

Could also make a blog entry pointing back to:
http://blogs.jboss.com/blog/slabourey/2007/04/24/New+Development%2C+Distribution+and+Support+Model+for+JBoss.txt
http://blogs.jboss.com/blog/slabourey/2007/07/11/JBoss_Enterprise_Application_Platform_EAP_4_2_released.txt

There were also thoughts about logging some relevent message to the console at start-up.

Other relevant pages:
http://www.jboss.com/products/updates (supported products / versions)
http://jboss.com/products/platforms/application/faqs (eap faq)