Just make sure you have a good policy regarding comments.
You should also do an analysis on top commenters and see if they have done anything to improve the wiki besides commenting and starting discussions. If they mostly don't do any editing, you should consider turning comments off.
Leigh methinks it'd be nice if the menu has a miscellaneous link or something. I couldn't find the picture book page, I'm sure there are other pages rarely visited because no way to get there except maybe the search bar. >.<