I found a great travel adapter for a reader! It's based on a USB connection:
http://www.dealextreme.com/p/ultra-m...-240v-ac-19242
The reason most readers only have a 200Mhz processor is because it saves them loads of energy. IF you'd have that same reader with a cortex A9 1Ghz processor, first of all, you would never really need that power (other than to reduce the first loading time of a book), and your battery life would go down from 1-2months to 10-20 hours (or from 10-20hrs to 6-11).
A fast processor imho makes sense when the screen is LCD, but not for e-ink.
If we ever get to the point where e-ink response can be improved, and latency can be reduced, then it might be interesting; however I would love to see ebook readers with a slightly faster processor too. Perhaps a 22nm 3d gated design running on 400mHz would use about the same power (or less) than current 200Mhz processors; but it'll be a while before ARM shifts over from their 65nm design