Websphere Application Server does not support JEE 5
The article incorrectly states that JEE 5 has already been added to IBM's WebSphere Application Server 6.1. In actual fact, WebSphere is in a worse off situation than JBoss. JEE support is scheduled for inclusion in WebSphere 7, which, like JBoss 5, has no release date set yet. WebSphere 6.1 users can get a JEE 5 feature pack, but this is unsupported for production use. JBoss 4.2 however comes with a 99% compliant and supported JEE 5 container out of the box, and JBoss have had their pluggable EJB 3.0 container available to users for a lot longer than WebSphere have had theirs.
The thing that WebSphere 6.1 did include was a Java SE 5.0 JVM, almost 2 years after the release of the Java SE 5.0 spec, and a long time after JBoss shipped versions that were supported on Suns Java SE 5.0 JDK.