The Wicket folks have released the latest incarnation of the framework in Apache Wicket 1.4. Notable improvements are:

• Generified IModel interface and implementations increasing type safety in your Wicket applications
• Component#getModel() and Component#setModel() have been renamed to getDefaultModel() and setDefaultModel() to better support generified models
• The Spring modules have been merged (wicket-spring-annot is now obsolete, all you need is wicket-spring)
• Many API's have been altered to better work with Java 5's idioms
• Wicket jars are now packaged with metadata that makes them OSGI bundles

What are you waiting for? Go get it!