Reasons such as this are the main factors in my possible switch to Apple.
Windows works well enough for me (2000 and XP Pro), it's what I use at work, I have a significant investment in software for the platform, and I am proficient with the OS.
However, it's becoming more and more clear that those factors will not overcome the direction that Microsoft is headed in. I cannot support a company that prevents me from using property that I own in any way that I see fit.
I bought my current laptop (Dell) in September of '01. It came with Windows 2000, but was close enough to the launch of XP that I got the XP upgrade for an additional $20. I was discouraged with the product activation, but went ahead with what Microsoft asked of me. Not too bad by itself, but scary in regards that it's an early step (along with DRM/Palladium/etc) that it's quite concerning. I would probably revert back to Windows 2000 if it weren't for cleartype.
I've tried Linux, and while it's okay, I found myself spending way too much time fiddling with it, and not enough time doing what I really needed a PC to do. Add to that the fact that the majority of the software that I need either did not function on Linux, or had no suitable replacement on Linux.
I think that OS X will give me what I'm really looking for...a turnkey OS that provides most (if not all) of the software I need on alternative OS that I don't have to spend 90% of the time reading howtos or searching the internet for solutions to mounting disks and tweaking kernels.
I'm still on the fence, but each day I'm leaning more and more from Microsoft.