I'll throw my hat (or email address) into the ring after Justy:
moethecat@gmail.com
I got my BeBook with a €25 discount (although I don't remember who's email address I used; it was back in August). I'm thoroughly enjoying the device and would recommend it to anyone.
Also, if you don't want to use Justy's or my email address for your discount, and would rather help out the folks at OpenInkpot, you can get the same €25 discount when you buy your BeBook by using Lunohod's email address (lunohod@gmx.de).