It's a must-see site for docs. Some of his latest publishings have been a little esoteric (if not sort of pro/anti-quasi commercialized almost simultaneously), and super esoteric for non-docs, but there is a treasure trove of great info on his site, not just for docs. I get all the emails/publications and read them start to finish, even if I'm not interested in the topic, but because I know he will have some unique and insightful perspective into something I've never thought about before. His site should be required reading for getting out of medical school, as well as Millionaire Next Door, but never will be, unfortunately.
If you're a doc, you owe it to yourself to check out his website.