Total sidenode but "Gates Notes" has to be one of the most exotic personal blogs I've ever seen. At this point would you even consider this a personal blog?
Yea, well I would consider it that in the sense that it seems like a mix of his personal interests, history, and promotion of stuff he cares about (his biography and foundation and various projects he's on). Its a unique site because he has the cash to hire people who put a great UX experience on top of it all. I think that's the main difference.
Not that he's unique in this, but I do really appreciate his book lists. I usually grab a few books during the year based on his recommendations.