We can start NetBeans 6.5 with the new Nimbus look and feel if we use JDK 1.6.0_10. We only have to use the command line parameter --laf Nimbus when we start NetBeans 6.5. So if we invoke netbeans --laf Nimbus NetBeans starts with the Nimbus look and feel. The following screenshot shows the Options dialog window with the Nimbus look and feel:
