Fonts, fonts and more of them:
Yes I forgot,
more Fonts or better yet, as HarryT rightfully noted of having it open to the user to install. It would be great to offer in different languages: cyrillic, kanji, etc
On undershooting:
I have some experience with mobile devices and I think alot of the technology is there but not many companies for different reasons don't want to take the innovative risk or design commitments. Maybe it is a rush to market mentality or inexperienced design teams, but many designs go the feature-laden, bloat route and end up missing the user experience. I see this alot with MS products because of their OS dominance. I was excited with their Origami teasers of the new UMPC sub $500 do-everything device, but the current lead is now taken but the Linux powered, nimble, open, Asus eee. I think the Zen of Palm, brought out by the old Hawkins team applies here along with Apple and the lead with multitouch. Listen to the users, support the dev base and don't over promise and under deliver with buggy bloated messes.
I really feel for the Irex Iliad because that is what I wanted in lieu of the Kindle for the touchscreen, and native pdf, but their potential is still nesting with slow dev movement. The incredible work of the MobileRead devs motivated by users outshines what the companies can do.
Unfortunately this view is in the minority, but it is my hope that the companies designing these devices will take user experience which includes long battery life, to heart. And better yet, that users back with their $ support.
Global warming is pushing more action to Green energy and we'll need devices that are more efficient and functional to that end.
Best,
tony