It seems my good friend and brother Edem has begun a tutorial series on JBoss/Seam on his blog. If want to learn how to develop with JBoss/Seam, I think you should definitely check his blog out.
He kicked off a while ago with a post showing how to set up NeBeans 6.0 for Seam development. Just today he posted a second part where he gets into actual Seam development.
