The Astak Mentor is a 6" reader, with 512Mb of internal memory and an SD Card reader. It weights 175 grams and supports TXT, ePUB, PDF and more text formats.

Astak Mentor photo

The Mentor has a 400Mhz CPU and runs Linux 2.6. It also includes a SuDoKu game... It's available now for 280$.

E Ink display info: 
6", 4-level gray scale, 170dpi E Ink display
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ynvisible ink kit - create your own electrochrommic printed displaysynvisible ink kit - create your own electrochrommic printed displays