Plone! (Score 1)

I've been developing with Plone for 3 years, and admit that like any other complete web app out there there's a learning curve, but - Martin Aspeli's book is precisely the sort of clear and useful document a web developer needs to get started with an great application like Plone. It is also a solid guide for any seasoned Plone integrator to the direction Plone will be taking in the future.