I'm currently running my web application on Java1.5 codebase, running it on Tomcat 5.5 and MySql 5. Looking through the list of additions that were added into Java1.6, I have to ask the question, "Is there any compelling reason to move from 1.5 to 1.6?". There seems like an incredible lack of necessary improvements and additions. A lot of changes in Swing (not that interesting). Keep in mind the current web application is stable (-ish) and moving up a version always entails some risk.
Am I missing anything important by not moving up? Is there a good reason to move up?