I know that OS X names are taken from big cats but when I hear those three put together, my first thought is: German tanks. Tiger and Panther were main tanks in WWII, Leopard was designed in late 60's and after many revisions is still used by many armies. That could be an interesting alternative mental image to keep in mind with all those OS X vs. Longhorn discussions... I will be getting my first Mac system (most probably PB 15') late July, but I've been reading Macrumors forums for over two months - and I've learned a lot. Thanks everybody.