I have two pet peeves for eBook readers:
- Fragility of the device
- Battery gauge is not accurate on my K2
They're not big enough pet peeves to be a threat to them, but it is only a matter of time before someone builds a ruggedized eBook reader. One that sacrifices compactness and lightness for impact resistance.
There is a similar movement going on right now for compact digital cameras. Olympus makes the Stylus Tough series, Pentax has their own series too. They have rubber bumpers and sealed enclosures.
Or maybe just a ruggedized hard case for the original devices, like they have for using regular cameras underwater...