Stackoverflow is a new site geared toward answering software development questions. You might want to give it a shot and help answer db4o related questions that are starting to appear in the website (it would be a good thing to monitor such threads there also).
See http://stackoverflow.com/questions/tagged/db4o
In this specific thread:
http://stackoverflow.com/questions/21207/db4o-experiences
someone says the db4o forums are useless. Do you think that's the case?
Thanks Goran for letting us know about this great resource.