I was quite impressed with a few new features shown in the keynote, such as Time Machine, and Spaces, and the Backdrops in iChat, however I have never owned a Mac, and probably never will. But, like everyone else is saying, and Paul is saying, they surely aren't breakthroughs... which they are calling their new features probably because of the graphical appeal that they provide to the end-user. Time Machine's implementation of Core Animation is quite impressive, and that very fact is quite cool... but they sure do push their features out to the people as if they were never seen before. Even when I was watching the keynote, and they introduced Spaces, sure, that was cool, but all along, there's always been virtual desktops (mostly)... that's nothing new at all. But the way they did it, I sure like.
That is the only thing I respect about Apple, is their ability to make things flashy, and graphically appealing. With animations, and Quartz (the graphical presentation system of Mac OSX), it's bound to impress... but with their features as opposed to the PC, simply cannot match, no matter how "good-looking" it is.
Vista's WPF (Avalon, .NET 3.0) is gonna blow things away too, though. I've seen examples, and everything, and it's awesome! The way that it utilizes DirectX 10 for rendering everything.
But, like, I couldn't imagine myself being part of a cocky, snobby community of "1337 Mac us3rs" that only live to bash Windows, and Microsoft.