I was intrigued enough to continue reading the rest of their documentation for advance usage and architecture design. I love simple and yet productive libraries/framework design principles, and I think Tapestry fits into that category. Their documentation is rich and well organized. I browsed their forums and user communities and they seem to be active and plenty of usage in the field. I also found these jumpstart examples to be extremely helpful.
I am happy that I spent the time in learning this framework. I think it makes web development easy, fast and fun to work with. If you haven't tried it before, or have not tried their latest version 5 lately, I would highly recommend you to give it a try.