If you've been looking for a good quality portable keyboard you might just be in luck. Econo-Keys just announced the EK-76-TP mobile keyboard, which actually has a touchpad on the back for greater flexibility.
The only real problem here is if you want to use the keyboard and the touchpad at the same time. I could see that presenting a serious problem. Even so, it's small and lightweight, measuring in at 9" x 3.5" x 0.4".
Likewise, it's compatible with Linux and Windows operating systems, has USB connectivity and is resistant to water and dust. It's washable as well. You can get the Econo-Keys EK-76-TP mobile keyboard now for $131.40.