Single source for content? That's like saying the iPod has a single source for content. You can put all sorts of formats on the Kindle, it's just that you might have to use their email conversion thingie to do some of them (PDF, Word, etc.)

First you lamented that it's too expensive, now you just wish it was better. Both of these problems can be solved by... waiting a while. It took several years to get from crappy portable MP3 units to the iPod.

Not everyone hits a home run so early on like the Empeg guys did. Given how new usable e-paper technology is, I'm happy the devices and price points are where they are.