I am not convinced that we have to remove the reference to the datepicker project which is now at Wicket stuff. It is there for backwards compatibility. I don't know why the datepicker part of the wicket migration guide has been pulled.
Martijn -- Vote for Wicket at the http://www.thebeststuffintheworld.com/vote_for/wicket Wicket 1.2.4 is as easy as 1-2-4. Download Wicket now! http://wicketframework.org
