I think carrying a cell phone, camera, and an mp3 player in my pockets is a massive pain, especially in the summer. It's more things to weigh down my pants, more things to keep track of, more things to charge, more things to potentially lose, more things to worry about replacing, and with satellite communications resources (potentially) at the helm of our music listening experience, more things to need a subscription for. Are you a mobile person, travel often? Then you might relate. Merging these devices sounds like a hokey idea to some, but this is because the current states of these devices are somewhat incompatible. If a merge is eventually done well, the public will devour it like vultures. It will happen.

critical factors: music player interface, battery life, memory, and size... cell phone clarity, battery life, and size.... organizer size, interface, OS, bandwidth.... camera memory, resolution, interface, display, and size

order of importance: size, interface, battery life, memory, clarity, resolution, display, OS, bandwidth

I guess though that this order would depend on how often you use each feature. If I had the 1st 6 factors maxed out I'd buy this product and never need another device (besides my computer) ever again. Max out the last 3 and I won't need a computer, maybe just a spare backup hard drive. Hokeyness depends on the personality (or lack thereof) of whoever designs this merge. Practicality and feasibility depends on the engineers.