After a fair bit of tweaking, I was able to get the SEAM booking demo running on Glassfish (caveat: there are still a few minor things that are not working right).
You can read about it here:
http://blogs.sun.com/roller/page/warren#getting_the_seam_booking_example
Yep, Roger Kitain from Sun has sent me a bunch of stuff to get Seam examples deploying out of the box on gf, using ant deploy.glassfish. Sorry I did not yet get a chance to integrate this stuff.