While I'm not adverse to the use and proliferation of the Apple Macintosh, the recent flurry of ads are reminicent of the Pepsi vs. Coke ads we've grown to... well... they just are. I am NOT a fan of confrontational "We're better than you, because you suck" advertising.
Apple's accusations are false or at least biased in their portrayal of the Windows-based PC. They downplay the capabilities that Windows has had for a very long time. They try to hold onto their known skills, neglecting their new found skills in being asymulated onto the Intel processor. The OS is solid and they do have a very clear style in both the exterior and the OS, though Windows is comparable.
There's no reason not to buy a Windows PC. However, there are deminishing reasons why you may not want to buy a Macintosh. For kids, there are fewer "natively Mac" games, while there are methods to get the newest Macs to run Windows, this is much more effort than simply buying a Windows PC. The foray these machines have owned is graphic arts, video, and music. They still own this, though the Windows platform is progessing nicely. Windows Movie maker is a decent application, though I'm a bigger fan of Quicktime Pro for Windows when it comes to quality, even on the competing platform.