From Ars-Technica, by John Siracusa. His OS X reviews are essential for any Mac nerd or regualr computer geek. He talks about EVERYTHING (from the packaging to Unix file permissions), some things to arcane for my blood, but fascinating nonetheless. I always look foreard to reading these bad boys every time a new release of OS X is released.
http://arstechnica.com/reviews/os/macosx-10.4.ars/1
http://arstechnica.com/reviews/os/macosx-10.4.ars/1