As a Project Manager with a mandate to come up with a Content Management System for my organization, over the course of the past three months I've found the CMS Bible by Boiko simply essential, as most of the other 'bible' tech books I've read have been. He provides a very robust framework that you can follow in your project, if you have the time to read through its almost 1000 pages.
First, he delves into a very thorough discussion about the more 'phylosophical' topics of content (what it is, what is data, what is metadata, etc.) and content management at large. If you haven't gotten your feet wet with a CMS project before, the first 10 chapters (175 pages) will get you soaked with the type of dilemmas you are bound to face when you work on a CMS.
Then, he provides what could be considered a "recipe" to put together a CMS successfully (though no two CMS projects are ever alike, but a lot of them have similar characteristics). There are a number of chapters and sections specifically devoted to the steps required to ensure a successful outsourcing of the project, but the framework he provides is not limited to it: you can perfectly apply it to an in-house implementation. Also, he tends to paint the largest possible picture (with all staff possible, etc.) but you can very easily scale it down to the size and shape of your organization.
In general, his framework goes back once and again to the concept of the "Wheel of Content Management" where he connects the spikes that allow the 'wheel' to move: goals and requirements, audiences, publications, authors, acquisition sources, workflow and staff and access structures, all revolving around the central content component classes with metadata as the outside of the wheel, serving as a container for it all.
He doesn't wrap up the book without devoting enough space to XML and its close cousin, the DTD. He even provides a small VB app to convert Word content to XML, and that's still "only" on page 788. If you haven't noticed by now, this book is MASSIVE, and if there's any issue with it, that would be it: the fact that you will need to devote a long time to processing it. But all in all, the book with its companion web site is an invaluable tool for all Project Managers who have in their hands the responsibility of giving birth to a CMS for their organizations.