So in short I think Apple is a bad open source 'citizen'. They take a lot, give little back, and have the bad form to not share their patents with the open source community they take so much code and talent from, and who ported so much software rooted in linux to OS X. Instead they sue (HTC) or threatened to sue (font issues).
On the other hand, they do make very good software, not particularly fast or complete, but so very well integrated.
I have been watching the whole linux development, from kernel to the desktop environments and most of the major software packages. It is all so disorganized and duplicated efforts. Only look to the situation with sound to understand what I mean.
There is a clear advantage to having a person like Steve Jobs in charge. The anarchy in the linux world that is our strength is also our biggest weakness.