This is the book that all designers and developers wish their clients would read.
Lots of practical advice for business owners on how to choose a great designer or developer for their project, how to have a successful project (hint: deliver your stuff on time and give constructive feedback).
Then it goes a step further and gives great advice on how to run the site long term (which few designers/developers do well). If you build it they will not come. You need to generate content, engage in social media, build an email list, and a bunch of other things that Paul gives you a great overview of to get you started.