Your comments in The Art of Unix Programming about Apple/Mac developers being diametrically opposed to Unix developers in development style and emphases (designing simple, user-friendly interfaces from the outside in) were quite interesting. I am wondering about your perspective on Apple now. My interest is specifically in Apple's contributions to open-source (WebKit and LLVM, chiefly) and your take on those. It seems to me that Apple has done quite a bit to foster an alternative ecosystem to the GNU environment, for instance in FreeBSD's adoption of clang as their default compiler; and also it seems to to me that WebKit has supplanted Gecko as the most widely used browser framework. Curious about your viewpoint here.