I'd call it a single, but certainly no RBI. If you're the sort of road warrior looking to lighten the load, the iPad can do a Keynote presentation, so that's half the travel weight of a MacBook Air -- no small thing. I'd be tempted to leave one around at home for night-time web surfing, keeping up with mail, etc. -- all the things I presently do with my iPhone and/or Kindle.

Still, at least for me, I don't see myself buying it, largely because my MacBook Air and my iPhone, together, really do everything I need to do.