Comments and markups attached to each version

We need to see old versions with the comments related to each one, as well as a "Compare Revisions" feature. Just so the reviewer knows the changes have been made.

Comments should restart fresh every time a new version is posted. Otherwise there are comments hanging out in the middle of nowhere because the new version is different.

If you need to take a look at someone who's doing it right, check out GoVisually.com.