One of the important new features of the JMX API in Mustang (Java SE 6) is the ability to create MXBeans. MXBeans provide a convenient way to bundle related values together without requiring clients to be specially configured to handle the bundles. Here's the complete story about MXBeans.
Great new feature for JMX-based applications. When I read articles like that, I wish I could already use Java SE 6 in our production code because it could tremendously reduce the burden of JMX handling.