Specification

The EJB 3.0 specification can be downloaded from the JSR 220 at the JCP (Java Community Process) website after clicking through the JCP's online agreement. The specification is very large, but there's a download named 'ejb-3_0-fr-spec-simplified.pdf' that is very short and highly recommended as an introduction to EJB 3.0.

Documentation

1. Annotations, XML and Defaults
2. Security Annotations
3. Transaction Annotations
4. EJB Injection
5. Resource Injection