Actually, the "agoraphobia" thing could work for us. Agoraphobia
means "fear of open spaces" (or, perhaps, Open spaces). So
agora also has an association with Openness. We could even
create a newbie section of the web site called "Overcoming
Agoraphobia."
The fact that there is already an OSS project called "W Agora" is
an issue, but I'm not sure that it's a deal breaker.