I just don't think the IPAD will be a laptop, netbook, or any other replacement for anything. It may be a whole new reason to be plugged in, but I don't see it as a replacement. More than half of the apps are games according to PC World. So you'll be able to play solitaire or Qbert more often. You can't play console games with your fingers, so it won't replace that. Maybe we'll be more like South Korea where games are more important than taking care of our kids, or our kids will be on the IPAD so much we'll get more sleep.
We may even decide to travel with them to watch movies and send email, but we'll still need our laptops.
In a few years this could, and possible will change. This just doesn't work in it's current consumer only form.