Few interesting new features are being added in EJB 3.1, the main ones are listed below. Asynchronous invocation is definitely a BIG plus.
1. no-interface session beans
2. Singleton session beans
3. Asynchronous invocation of Session beans
4. Global jndi names
5. TimerService enhancements
6. EJB Lite
7. Packaging enterprise beans within a WAR
8. Embeddable EJB containers
More details at
http://www.theserverside.com/tt/articles/article.tss?l=EJB3-1Maturity
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