The 6th major release of Mac OS X is here. The long awaited release was delayed due to resources needed for the iPhone but it finally shipped on October 26th. There are over 300 new features in Leopard. Time Machine is arguably the biggest new feature but there are many other features that make this new OS well worth the $129 asking price. For the purposes of this review I am going to focus on a few of my favorites. These include Cover Flow, Quick Look, Spaces, the new versions of Mail and iCal, and last but not least, Stacks.