Adding to the stockpile of features that I've packed into seam-gen in recent months, I just committed a new seam-gen command that generates a front-end to Seam's identity management API (JBSEAM-3717). Identity management is one of the most significant additions to Seam in the Seam 2 code base. But since its just set of framework classes, you need something to tie it into your application to truly appreciate (or even give notice to) its potential.
I finally got around to weaving my modifications for adding GlassFish support to seam-gen (documented here and here) into the Seam project (JBSEAM-1619). While working on integration the changes, I managed to close the few remaining gaps and also add support for JBoss AS 5!