Nick Wingfield wrote an interesting article on the Wall Street Journal site called Time to Leave the Laptop Behind and I think he did an excellent job at articulating the options, trade-offs, and current state of mobile devices for the road warrior. Mobile phones today can be extremely powerful and capable so that some people are using them to work on the road. I personally have traveled a few times with only my mobile phone and a REDFLY Mobile Companion and think it can be done. However, I am not sure that the minor savings in weight is worth the compromises you need to make a mobile phone work for you.