BeBook
The screen used in the bebook is identical to that of the sony - and unlike the sony (I think), you can can change the font used on the bebook. It's also an open device, look at the openinkpot project for example.
I've made a video review of the BeBook, which you can see here.
http://pookey.co.uk/blog/archives/61-BeBook-review.html
For IT geeks, I honestly think the BeBook is the best choice.