I work for a very large (Fortune 500) retailer whose customers are overwhelmingly Mac users. Safari users make up just shy of 50% of all of our traffic, with Chrome accounting for 25%.

I'd guess that's as much because Safari is the built-in, default option on OS X and iOS as it is because Safari is just super awesome. The more interesting thing to me is that all of my (Mac-using)coworkers have switched over (mostly from Firefox) to Chrome, despite Chrome's overall jankyness on OS X.

Are these stats based on his site's users? If so then I'd expect them to skew towards Apple fanboys, not just Mac users. I use a Mac, but I can't stand to read Daring Fireball. It's like the Fox News of tech blogs.