I just know that the final release of
Netbeans IDE 5.0 has been released and was trying my luck to upgrade my current beta version with the IDE Update Center instead of downloading the installer separately. But I just couldn't upgrade anything but features and libraries by using the Update Center. Despite the fact that some other good softwares like
Yahoo! Messenger and
iTunes also require the users to download the entire installer all over again, I find they're better in this upgrading mechanism in the sense that they alert you the updates upon startup and allow you to download the newer installer within the software itself.
However, this is only a minor and non critical feature which I'd like to have in Netbeans IDE.