If you haven't done so already, I suggest that you go and pick up Netbeans 6.5 at this time. It is arguably the best IDE release ever. Along with the Java feature updates, this new version of the IDE includes Groovy support, compile on save, and Python support is available in EA format.
If you want to migrate your libraries from an older version of 6.5 (release candidate), simply copy the project libraries files. See this wiki article for more details.