NetBeans' portability matters
In his blog today, Charles Lamb points out precisely one of the advantages of NetBeans over Eclipse - portability.
With NetBeans, exactly the same bits run on any platform with a 1.4 or greater JVM - there's no native code to worry about. You can take the zip distribution, just unzip it on any machine with a modern JDK and there you go.
And more importantly, working with a J2EE project requires no configuration, no additional downloads - it just works out of the box, which Charles also points out.