iPad. I write for a living and I use my iPad more than my Mac these days. Anyone who says it is 'for consumption' has never used one.

Here are the pros for touring: maps, camera, GPS, always-connected Internet, light, tough (although put it in a case that will protect the screen). It will also replace books, plays music and movies and the battery lasts forever.

If you plan on writing a novel then you can use any keyboard with it -- Bluetooth or USB.

One note: think about getting the (now much cheaper) iPad 2. The camera is terrible, but the battery takes half the time to charge. The new iPad has a giant battery to power it's hi-resolution screen, and that takes many hours to charge.