Bitcointalk is rife with censorships (example:
https://bitcointalk.org/index.php?topic=118154.0), and people who disagree with mods are being banned (example:
https://bitcointalk.org/index.php?topic=120102.0 goat banned by mod who has a conflict of interest with GLBSE), the forum's ban on NSFW stuff (we're not children here). This thread isn't for discussion about those, but how an alternative bitcoin forum could be created that isn't censored and is free (in openness and liberty).
A few ways of doing it:
1) Upvotes and downvotes like Reddit, Quora, Stack Overflow.
2) Democratically elected moderators that can be removed if they abuse their power like what's happening now - similar to stack overflow.
3) People who are ignored by X% of the people have their posts automatically collapsed.
There obviously needs moderation or the forum would be full of spam advertising. Low quality spammy posts used to promote certain sites would also impact the discussion values, but how could moderation be handled in a fair and uncorrupt way?