Jboss

redhat.com | JBOSS NA Channel SKUs [ i.e redhat jboss pricing ]

http://www.redhat.com/f/html/jboss_channel_skus.html Pricing and SKU numbers for Redhat JBOSS offerings

Jboss Cluster in the Cloud | JBossWorld, Redhat Presentation [ban_w_310_running_in_the_cloud.pdf ]

http://www.redhat.com/summit/2011/presentations/jbossworld/whats_new/wednesday/ban_w_310_running_in_the_cloud.pdf

JBoss, Geronimo, or Tomcat? - JavaWorld

http://www.javaworld.com/javaworld/jw-12-2007/jw-12-appservers.html notes (mostly feature list) on open source java app servers