After a recent week long training Mystic gave a week ago, one item that came up was the examples as posted on the official Wicket website are a version behind. Available here: http://www.wicketstuff.org/wicket13/.
In response to throwing up the latest javadoc at a simple to remember URL on this website, the examples seem to be the next logical step to make available. So point your browser here:
http://wicketbyexample.com/examples
This is running the latest 1.4.6 release of Apache Wicket. Enjoy.