nobody has an opinion or an advice ?
Ejb3 is very well discussed for 3 years ;)
Look at theserverside.com - source for many good discussion on JEE.
For me most important is testability: you can start enity factory manager in 6 seconds without server ;)
Ejb3 is backward compatible, so would advice to write only new code in ejb3, and don't rewrite your ejb2 code but only when you really need.
thanks a lot for your url ! i found some topics very interesting !
it's fully answered to my question.