As seen here: http://www.wowhead.com/forums&topic=3464 at the very least I would love to see a xenforo guide for getting tooltips working. These are very important.
Please let me know if anyone is interested. I know a full blown add-on isn't required but a basic understanding of the themes & hooks in a nicely formatted guide will help a lot of folks out.
I don't know if this is something @Waindigo would be interested in since like I said it's less a mod & more "translating" for xenforo.