The SCBCD links at webpage points to a lots of references for SCBCD and EJB3.0.
I personally felt EJB3 in action was a really nice once to start and get lots of insight. After completing that you can go through the specs for complete details.
And yes, you can move this post this either the EJB or SCBCD forums so that other EJB experts can guide you.
This forum seems to be a more generic one and specifically meant to discuss about books.