Recent patches have been incorporated in the latest release of NetBeans but the main reason for this update is that its support for Java 7 is now fully certified.
We reported on the arrival of NetBeans 7 in April. It was the first open source IDE to support JDK 7 but, by arriving before Java 7 it could not be fully certified. Hence the need for NetBeans 7.0.1 which can be downloaded here.
It can be installed using the IDE plug-ins dialog. If you also want to update to GlassFish 3.1.1 and Tomcat 7.0.14 which are bundled with NetBeans 7.0.1 you will need to download and install them separately, and register them in the IDE's Services tab.
NetBeans 7 ready for action