Finished 'An Introduction to Seaside' An Introduction to Seaside does exactly what is says in the title. It walks the reader through building a "To Do Application" and by doing so covers an amazing amount of ground in just 138  pages, including more advanced topics such as database options, AJAX and the meta-framework Magritte. As such I would recommend it to anyone wanting a book providing a good detailed overview of what a Seaside application looks like.
 An online version of the book exists here.
 Excluding the Appendix. The printed book's length is 200 pages.