This is why I won't buy a Kindle. What I'd really like, is an E-Ink device about the size of a sheet of letter-writing paper (A5), based on an open platform (B

This is why I won't buy a Kindle. What I'd really like, is an E-Ink device about the size of a sheet of letter-writing paper (A5), based on an open platform (BSD, Linux, etc.), with a touchscreen. It would make not only an excellent platform for textbooks and reference, but also for taking notes and drawing. I'm half-tempted to build one of these for my own use; anybody know where I can get an A5-size E-Ink display?