This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Are you talking about EJB 2 or 3? I still see some legacy applications using EJB 2, including IBM products like WebSphere Commerce. EJB 3 is seeing some adoption, but many of the applications I use just leverage JPA without EJB 3. I still recommend understanding the core concepts of EJBs as they are useful patterns. This includes understanding the difference between entity and session beans, transaction management, etc.