I switched some projects to Netbeans 6.7m2 to test how it works. The L&F was totally refurbished on mac (see here). I included the screenshot into the wiki, so you can compare it directly with e.g. Nimbus vs. Vista.
Netbeans 6.7m2 works fine so far for me - stay stuned.
NEW MUC Airport Workshop: Migrating Java Client (Swing / Java FX) to Web Standards