I've long said that if you have an iPad you can certainly work from the tablet on the road. The biggest downside is the on-screen keyboard and much of that is because the virtual keyboard lacks a tactile feel. A product has hit the market called the Touchfire that gives tactile feel to the iPad virtual keyboard.
The Touchfire is made from a thin piece of silicone that snaps magnetically in place over the iPad's on-screen keyboard in landscape mode. The silicone keyboard overlay costs $49.99 and is available now. It weighs under an ounce and is about as thick as two credit cards making it very portable. Once installed the keyboard works just as it did without the overlay and touch typists will have tactile feel so they know where their fingers are when typing.