Amongst all of the speculation about the rumoured forthcoming 'Apple Tablet' computer, I came across an excellent article entitled Why The Tablet Will Finally Be Steve Jobs’ “Computer For the Rest of Us” on Cult of Mac.
It sums up what was important about the iPhone - hiding the complexity of the workings of the phone with a beautiful interface, and make it joyfully simple to use, with software that you know will work properly and safely. Apply the same paradigm to a (tablet) computer, and you have a true 'computer for the rest of us'.
It's worth a read.
Link: Why The Tablet Will Finally Be Steve Jobs’ “Computer For the Rest of Us” (Cult of Mac)