Please don't show, or show together in a different place, menu items which users don't have permissions to use. For example I don't mind if anonymous visitors view page history or want to discuss the page, but currently those two actions are mixed in with things they can't do, like edit or add tags for example, and there is no visual distinction between them.
thanks.
update: it would be sufficient to just display them differently, grayed out if they can't be used for example. They wouldn't have to be in a different place.