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this is something I'm looking for as well. We just started a jokes thread on my website and wanted some way of ranking them than replying to the message.
my suggestion, after the above mentioned features:
- searchable
- add comments
- sort by: rank, views, comments
- group permission on categories
- move jokes to different categories (owner/admin can do it)
- approval system (set groups are auto-approved)
- multi-sub categories
- notifications