drupal 7 comment moderation modules I am looking for modules that can extend drupal 7 comment admin. 
For example, I want to be able to set different statues for comments, like Approved, pending, spam and unapproved.
And maybe comment moderation history, in comment admin it should show a log of who changes the text, who changes status of a comment. the only module i can find is for drupal 6.
You should be able to "set different statuses for comments, like approved, pending, spam and unapproved" using Flags, which are D7 only.

I could not find anything that adds revisions to comments, or comments to flag changes.

The workflow module allows you to assign states to nodes, and comment each state change, but the comment_workflow module is available only for D5. Hopefully someone else might have better news.