MacBook Specs
As someone who's recommends Laptops to people for a living, and is currently looking for a Power User laptop personally, Apple is a serious Contender for one simple reason:
They have one of the Best specced laptops going at the moment.
Taking the 15" Macbook Pro, you can get:
2.4Ghz Core 2
2GB RAM
160GB 7200rpm Hard Disk
DVD SuperMulti Drive
nVidia DirectX 10 Graphics.
Giving those specs to my Dell account manager, the only thing she could get with those specs was a desktop. I've also looked at HP, Samsung, Falcon......
Add to that the fact it's a great looking piece of kit, and will happily run OSX, Vista, and XP, it becomes a viable option
Seriously, if someone can find a pure PC based equalivient specced notebook, I'd love to know about it.