I saw this article on the improvements from E-ink that are coming. There are two videos, one of a better screen that can handle simple animations, likely getting into actual products you can by in about a year (early 2011).
The other was low power, but more durable. The guy in the second video smashes a fist into the screen.
I like the idea of e-ink, but after having a Kindle, and and iPhone, the iPhone just works better.