With the 1.4.2 release we provided two new look and feels for Swing: XP and GTK. Rather than taking a break, in 1.5.0 we're providing two more look and feels: Synth, a skinnable look and feel, and Ocean, a new theme for Metal. Beyond look and feels, we've added printing support to JTable, which makes it trivial to get a beautiful printed copy of a JTable. Lastly, after seven years, we've made jFrame.add equivalent to jFrame.getContentPane().add().
Refer to the documentation at Swing http://java.sun.com/j2se/1.5.0/docs/guide/swing/index.html.