By pelegri on Sep 07, 2007
Julien (at Aubiere) provides an evaluation of the main Open Source AppServers: Apache Geronimo, GlassFish, JBoss and Jonas and his choice is GlassFish. He mentions the usual reasons (documentation, console, RI) but also one that is less common: domains which turn to be very useful for teaching a class.
Julien also mentions jRuby and GlassFish v3 support as additional reasons. Check the details at his Blog entry.