A list of the most prolific posters shown in each forum.
Not just the members with the most posts, but those with the most posts in the last week or month.
That way, members with vast post counts but who haven't visited for ages are ignored.
Maybe the list is updated daily for the previous day to save on database usage.
If you're on the list you could get a trophy. Or maybe if you've been on it for a certain number of days in a month.
The list is designed to encourage people to return and post often.
There is a potential problem that people on the list might get approached privately in conversations for answers. For this reason, people can elect not to be on the list if they don't want to be.
Is the idea a goer?