Need help on J2EE

Hi Genies
I am basically a java programmer and did lot of applets and application for two years. I was in the R&D for last 16 months and when i look back at the java it's gone very fast. Now i am lacking knowledge in J2EE. I know reading books won�t help that much so i would like to learn with some practical work. I heard that some Java technology-based open source projects are available? Did anybody know about it ?
If yes please advise me to some site or i am glad to work (not for money) with any Java Guru's from this forum to improve my knowledge.
Thanks
Shan

www.jboss.org

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