Some time ago I reviewed the drafts of the new book from Wicket rockstar programmer Igor Vaynberg: Apache Wicket Cookbook. If you are serious about using Wicket, this book is for you. It is fast, to the point, has very clear code samples and teaches you all the relevant (both clean and dirty) stuff you need and which Wicket in Action could not cover.
Conclusion: this is the book to read after 'Wicket in Action'.
