I have to agree with lammert,jecascand and BillyS.
I was at a meeting last week and guy was trying to use a netbook to push around the web on the projector. I needed him to type in a URL and the tiny keys were awkward for him. My sister got a netbook and hates it because it is too small.
I have a smart phone that maintains my calendar and I can read emails if I need to, but typically I don't bother.
That said, I'm not traveling much these days.