Leopard installed on my new iMac in about twenty minutes. Granted, this was a fresh install and I skipped the DVD verification as well as opted out of installing all but the Gutenprint drivers and English languages, but that's still pretty fast. So fast that I missed the new Leopard intro movie. I walked out of the room expecting the installation to take an hour and came back shortly after to find the setup panels waiting for me.
I had seen the leaked movie on YouTube a while back, but that's not exactly high quality. And since Leopard is the first version of 10.5 to be released in a fully HD age, I was looking forward to seeing the new movie. Luckily, ArsTechnica uploaded it as part John Siracusa's excellent and exhausting review, so I could finally watch it in high resolution.
It's gorgeous. If this was your first Mac, and your first experience with an Apple computer was the intro movie, you'd be in heaven. Hell, it's my 7th Mac and I fell in love all over again. These little touches are part of what continues to separate Apple from the rest of the pack. Contrast this excellent movie with the Windows Vista boot "orb" to get a better idea of what I mean.