John,
Sun still offers the Sun Java Application server. It is based on GlassFish, the only difference between SJAS and GlassFish is a graphical installer and paid support.
Pradip,
Quite frankly I'm not sure what the benchmark covers, I closely follow
The Aquarium, a GlassFish blog, there was no mention of what actual APIs were covered in the benchmark.
Regarding documentation, I'm not familiar with the JBoss documentation, therefore I can't really comment on it. I would like to think that there is at least one pretty good book on GlassFish.
David
[ November 27, 2007: Message edited by: David Heffelfinger ]