The JBoss AS download page at http://labs.jboss.com/portal/jbossas/download claims
Important Note: If you want to use EJB3 or Seam, you MUST use the JEMS Installer.
This is no longer true for Seam 1.3 and up, which are (will be) running in JBoss AS 4.2 CR1 (maybe because this version has the EJB3 deployed by default). So, it would help people if at least "Seam" is removed from the warning above.
The Seam Getting Started at http://labs.jboss.com/portal/jbossseam/gettingstarted states
For Seam 1.1.5.GA, download JEMS installer 1.2.0.BETA3 and install JBoss AS 4.0.5 with
the ejb3 profile selected. Do not install any other version of JBoss, and do not try to install
JBoss using any other profile, not even the all profile.
I think this could read
For Seam 1.3 and up, download and unzip JBoss AS 4.2 CR1 or better, and use the default
configuration (which includes EJB3).