Tony Rizzo is one of my hero's. I've learned so much from him over the years. His speciality is Critical Chain multi-project management. He is one of just a few original thinkers on the subject and has previously shared much of his thinking and success via the Constraints management sig.
Now he has started two blogs: The Project Management Soap Box and Shareholder value.
These aren't like your typical blogs. They read more like chapters from a book (and I expect one day they will become chapters in a book) so they'll require more effort on your part to read them. Tony doesn't just link to other items of interest (like I do most the time), instead he's providing new, powerful, thinking on how to manage projects and product development organisations.
Go read them. Read them twice. Study them even. Then ask him questions. Please.