While I spoke negatively about "10-inch" Netbooks (above), I now think that I was too negative. My (approx $300) 10.1 inch MSI Netbook, slipped into its padded sleeve, goes into the bottom of my small carry-on bag for travel. I wonder whether Ultrabooks / MAC Air would be enough larger to present a travel issue.
In any case, I continue to agree that a real computer is the way to go, not an iPad.
seacue