Of all the announcements at WWDC, this one, as reported by MacWorld, impressed me most:

Jobs said that with the Leopard implementation of Vista, users will no longer have to burn a CD of Windows drivers or install those drivers separately — it will be built in to the operating system.

I know, that's hardly the most impressive to most, but for me, it shows how much Apple *gets* it. Now only will Vista be esay to install on your Mac, it'll be easier to install on a Mac than any other x86 system without it already.