Yep. If you go to the OI pages, specifically this page:
http://openinkpot.org/wiki/NetronixEB600, and click on the "here" in the line, "WIP. You can get alpha-quality releases here", you can download the latest WIP alpha release of OI for the Cybook.
Look, it's *ALPHA*. So don't expect that it's gonna have all the featurettes that you'll see on Windows using FBReader and the like, but you can now at least *see* OpenInkpot, Madshelf and FBReader running on the Cybook. From the SD card. Hooray Ondrej!!!
I must say that the 8/21/2008 alpha release doesn't actually "recognize" the navigation control (what some call the d-pad) as a navigation control under Madshelf. Instead, you have to press the left-side and right-side keys to mimic the Jinke V3's "1" - "6" numeric keys as well as using the power on/off key as the "Esc" key. Which means that to turn off OI from within Madshelf, you must use the central button on the navigation control to bring up the menu, press the "-" key to select "Scripts" from that menu and then press "Music" to select "Shutdown OpenInkpot", but it works and you can open and read PRC, PDB and other format ebooks (non-DRM'd of course) using FBReader.
The first photo below shows Madshelf and the second shows FBReader.
Yay!
Derek