There is nothing worse than having to navigate through some of the world's busiest airports whilst lugging around a heavy laptop as well. Enter EeePC from Asus. This low cost (USD300-700) computer allows you to surf the web (wi-fi), review documents and send emails. Not only does this little gem compete with normal laptops on price, the small dimensions (22.5cm (W), 17cm (D) and 2-3.38cm (H) and 1kg weight make it ideal for the business traveller. The latest model (EeePC 900) features an 8.9 inch screen, 12-20GB hard disk and built in webcam. Great for keeping in touch with the office or home. Whilst it certainly won't replace your laptop for long business trips (the keyboard is slightly small) and lacks the power for full scale presentations, it is ideal for the short business trip or using whilst commuting.
http://eeepc.asus.com/global/900.htm