WordPress.org

A plugin that automatically schedules pending comments for approval, depending on a min/max threshold and the last comment's publish date and time.
When a comment is posted or when the admin is logged in, the plugin computes the most recent interval when a comment can be auto approved and picks a timestamp in that interval when to approve the pending comment.
Optional: Notify the site admin by email when a comment is approved.
Warning All pending comments will be scheduled, make sure you have an antispam plugin in place. I wrote one over here.
Based on: Automatic Post Scheduler by Tetele

Coding by: MijnPress.nl Twitter profile More plugins