I think we need to do commenting AJAX like, like, no more refreshing the entire page simply to get your comments and gradings included. I see it coming in the user profile and forum signature, so why not the commenting system?

And I think we need to be able to add thumbnails of the respective pages above "first" , "previous" , "next" , and "latest" buttons. Make it optional.

And...hmm...what about adding "Buy Print" button feature for people who have made printed version of their comics? This will display a button that link to a url the owner of the comic supplied? This will make people who have their comics printed can promote it easily, and will give DD another HUGE advantage over other webcomic hosting