IntelliJ has nice features to do this... you can move EJB2 beans to EJB3 - it adds the annotations and such for you
(or so I've been told, I'm an eclipse user :)
You are right, we just upgrade to Intellij 6 and it does have that feature. I did give it a run (in preview mode) and it seems to keep the old ejbjen tags around which should hopefully be not a problem. I am planning to apply this on a simple session bean and deploy it in Jboss.
Has anybody already done that using Intellij?