Validation without roundtrips or duplicate code... also:
Feature Article: Ajax Form Validation Using Spring and DWR
Weblogs: Web services screencast, NetBeans interview video, and why kill -9?
Java Today: Video interview with Chet and Romain, SwingWorker tutorial, and Derby performance tips
Forum postings: Tracking device particulars, video on phones, and SwingX add-on vs. laf-plugin