I've faved loads of dead comics, comics that I don't really like and things that I've grown out of, how do I unfave comics?

If you expand your Favorites section over on the right there, there's a link at the bottom that says "manage favorites" (or something like that). That takes you to a page with all your favs listed, and you can click the trash cans on the ones you don't want to follow any more. :]

Thanks, skoolmukee