
Cats and Dogs...
The iPod is a remarkable product and flawlessly marketed, but sooner or later their monopoly could be unseated if someone were to come along with something just as good for less -- or better for the same price. As in twice the memory (8 gig) for the same $250 from a reputable company you've probably got some tools from already like SanDisk.
Way hip image? Good. Brand loyalty? Great. But this is a what-have-you-done-for-me-lately market. Much more of a cat than a dog.