Mobipocket Reader Desktop is now supporting the Cybook Gen3 for automated synchronization.
You can download a 6.1 pre-release from Mobipocket:
http://www.mobipocket.com/dev/beta/desktop.asp
From version 6.1, the Cybook Gen3 is recognized as a Mobipocket compliant device.
You don’t have to enter your PID. Your ebooks are automatically downloaded/transferred to the Cybook.
Additionally, you can import Office, Pdf, Html, Txt, Chm & Ocf documents.
And you can also synchronize the RSS feeds (eNews) you are subscribed to.