Tiger brought in new thing like spotlight. Time machine is the innovation in Leopard. I may not use this feature but most of the users would like to have it. It's not just the pride that comes with the brand, there are many more reasons to stick with MAC. Best thing about Mac is the user interface. MAC pioneered GUI, MS followed. Now Vista is vying for "WOW" factor which is obviously a MAC mimic. iLife, iwork and everything integrate so well that you don't have to worry about the technicalities of file formats in different applications. Stability is another plus point; might be the better quality software development tool. MAC is MORE secure than Windows. Yes, Microsoft is targeted by hackers because it has wider presence but don't forget the fact that there are multiple inherent flaws in Windows which makes it easier for us to break than MAC OS X. Free BSD is the core. I have a belief that open source software is more secure than their counterpart, because there are more unpaid, self motivated, enthusiastic minds working to make it safe. Passion yields better.