Going back to the point about running with iPods, HDs etc, I'd like to point out that iPods only access the HD once every half houer or so (unless you skip a lot).
It accesses the HD, quickly copies the next half hour's worth of playlist to flash memory and plays from there. That's (a) why it's good for running (b) got decent battery life and (c) why it the battery does falter if you skip tracks a lot, and more so if you change your mind about an album because it would copy album X to the HD, then expect a half hour break from intensive battery draining work but instead have to copy across album Y instead.
But anyways, apples are pretty, and I might buy me an iBook with my first few month's pay...
(and I love my 4th gen 20G iPod, he is called William)