Is this the blog:
http://breadboardconfessions.blogspot.com/ ?
I'm actually working on something similar for my dad who is a quadriplegic. I'm going to be trying to use a tongue switch to operate a Kindle DX (graphite). It should be getting delivered today, so I'm excited to take it apart and start playing around with it. I'm going to see if I can communicate with it through the serial port, which is also accessible on the Kindle 3 (
https://www.mobileread.com/forums/showthread.php?t=96442). I'm planning to use a microcontroller to interpret long and short presses, or even different sequences, to activate different functions (next/previous page and wake-up for now). My fall back is to try to solder directly to the buttons, but from your experience it looks like that might be more of a challenge than I had thought. I'll be checking in on your blog to see how things are going and I'll let you know if I discover anything that may be useful to you.
Cheers, and good luck!