I know there is no Sun courses any longer. There are Oracle Java courses. I have been to some. GlassFish ESB 2.1 for Implementers (SAS-4300) and Developing Applications for the Java EE 6 Platform (FJ-310-EE6). But also I have student workbook for Sun GlassFish Enterprise Server Administration and Developement SAS 4455 what looks interesting. Instaling and configuring is just obvious. But setting clusters, nodes, configuring load balancer and session replication sound really interesting. I am software developer but setting just right the environment for all the stuff is also important. I would hire administrator just for maintaining the system no for starting the whole world up :)