I just saw this and found it relaly interesting: http://arstechnica.com/reviews/os/macosx-10.4.ars Its very tech heavy and a bunch went over my head, but it does really shed some light on some of the really important changes that were implemented in Tiger. For instance, there is an entire section onhow the kernal behaves with multiple threads and hwot he changes made in Tiger will be very beneficial for multiple processor (or multiple core) systems. and the section about the declaration of stable API's and how it affects edvelopers. They detail some aesthetics, some technical stuff, and give a lot of insight into how much under the hood stuff is in tiger. I found it intersting anyway and wanted to share it.