The best thing about Robb Wolf (and the reason he's famous) is not his book or his website, it's his podcast. He gets the science and he's got practical experience training other people and training himself. He also has a very flexible approach to paleo and won't hesitate to change his mind when he sees good evidence (i.e. he's not dogmatic). Plus, he looks like he's a lot of fun in real life and he seems to be a real decent human being.
If you don't know much about him and don't know where to begin, just watch this: Blast From the Past
It's a talk he did at SUNY New Paltz and it's ridiculously good. He explains the logic behind paleo in a superb manner for uninitiated people.