We are using the MVC (MOdel view Controller) method of designing our apps because the learning curve for EJBs was to great...
You can write some decently smart apps with the MVC if you dont have time to learn EJBs.
servlets beans and jsps
model = Standard
java beans(businesslogic)
view = jsps(presentation)
controller = Servlets(flow control)
applets
controller and view = applet
model = Standard java beans
EJBs do seem very worth while but I just don't have a complete understanding ... yet.