I just started reading Mark Price Perry's new book - Business Driven PMO Setup: Practical Insights, Techniques and Case Examples for Ensuring Success. I've followed Mark's articles and discussion board postings on gantthead.com for several years. If you're looking to create a results driven PMO that leverages practical techniques, then I highly recommend you read his book!

You can definitely use the text as a useful guide to setup your PMO and link the PMO organization to actual business results.
Get your copy at:

Business Driven PMO Setup: Practical Insights, Techniques and Case Examples for Ensuring Success