Sorry, but iPad's 10" touchscreen is going to be it's first killer app, despite how so many seem to dismiss it.
The only thing a larger screen is good for is multitasking, something the iPad lacks. If I want to carry a 10" screen with me, I might as well get something that will fill in the holes the iPad doesn't, and for a lesser price might I add.
$50 says you own one within two years.
Unless they make an OS X version, you're on.
BTW I'm ordering a Dell Mini 10V tomorrow that I'll be installing OS 10.6 on.