Thank you, that wiki would be a great place to collect information. I already noted one niggle; in the networking API, one should test for NET_CONNECTED rather than the individual NET_*READY bits, to allow for future connection methods (USB tethered, perhaps). I haven't figured out how to enable editing or join the pocketbook-free project, though.
I've started in slightly on Doxygen-tagging the inkview.h header. Combined with the demo app, this got me some clarifications such as what Long (long tap) and Hold (pointer stopped after moving) pointer events are.
A copy of the current progress (limited, I know) is at
http://donkey.vernier.se/~yann/pbapi/. The API itself looks fairly manageable, but eventually I'll probably be down to a few questions or points that need testing.