The iPad will bomb with everyone except colleges receiving kickbacks from Apple. Don't get too worked up about it yet.
Ebooks don't seem that cheap, probably because it only costs the publishers pennies to print something. (Not sure about shipping... probably 25% to the retailer).
It's prime target is Kindle so I guess you can't really complain about the OS and you can't compare it to an Amiga. Amigas still lurk around as kiosk machines or possibly a POS machine.
The ipod was different. The iphone had apps. This one doesn't seem to contribute something new so I think it will bomb.