Java User Groups around the globe have banded together to work on Java Standards (JSRs) in order to improve their technical quality and usability by developers (avoiding the creation of well-meaning but not very useable standards, like the EJB 2.0's of the past). We have ~100 folks working on a number of JSRs, making some real positive difference to the standards that millions of developers will use going forwards. This initiative is a great way to dive into some core Java, JavaEE and JavaME technologies as well as giving something back to the ecosystem.

See http://adoptajsr.java.net for further details