I've been subscribed to his blog since he visited here a few months ago, and I'm a big fan.
His "case studies" into the past 25 years of companies are interesting, and it doesn't hurt that I agree with his personal philosophies almost to a T (which I'd describe as libertarian, though he doesn't actually use that word that I've seen - a strong emphasis on personal liberty, something very important to me). He's also quite personalable (has fun stories about Scrooge McDuck).
Probably one of my top 3 blogs, definitely in the top 5.
That post did come off as arrogant (see comments for explanation as to why - it's not a "character" like MMM, but he's rather straightforward).
Definitely a good case-study though.