It was only a matter of time until some clever hackers managed to get Windoze running on the new x86 Intel-based Macs. It was meant to happen, as the new Intel architecture is very much alike to the Win desktops that many of us have been running for years.
I had the chance to work extensively on both platforms. For productivity, Macs are far superior in my opinion. They just get the work done, period. No distractions in form of viruses, adware, all that junk that Windoze machines have struggled with for ages. My next computer will be an Intel Core Duo based desktop mac, maybe even a MacBook Pro, not sure yet.
Truth of the matter is, for people who are not as versed with computers are some of us, Macs are the far more intuitive and safe machines. Little things you can mess up, less harm that is put in your way. OSX was a huge leap forward in development, adding the BSD (*nix) core to the operating system was a great choice, and now the performance has taken a leap forward with the introduction of the Intel dual core processors.
ayla has a good point, there is still some software packages out there that were developed and written for the PowerPC hardware platform, the new macs have to use the Rosetta emulator to run it natively. But more and more of the popular apps are already available in the universal binaries, meaning they have been optimised for the new hardware - and more and more applications are catching up.
And fayden, your argument of lacking backwards compatibility is not quite rational in my opinion. Saying that your old OS9 apps don't run on OSX is like saying that you can't get your DOS executables to run in WinXP. OS X has been around for years now, just like Windows 98/ME/2000 and XP have been around.
My final point is, Microsoft writes ****ty code. All developers know that. Bloated operating systems with lots of bugs. Hell, the last Windows 2000 SP still left like 6,000 known bugs unfixed, and that's no joke.
Windows can be productive and stable, you just need to know a good amount of know-how to keep yourself out of harm's way. And the great majority of computer users don't have that. Macs are more secure, and they get the work done. Mac 1 - Win 0.