PerlBeans seem more like template-code generation than what EJB are used for..
The idea of EJB is that u program the algorithm (or if u want to say : buisness logic) in java-classes, define their interface and put it in app-server ..
After your code is up and running there (in some servers u can dynamicly plug/unplug modules), u write some client wich can in standard way find and create instances of this class anywhere on the Internet and call its methods in your app as it is local object.
At the same time app-server can create/pool many instances of the class in a scalable manner.