A good directory should be as smooth as butter . You shouldn't even notice that all the links work . Take the time to periodically spring-clean those links to make sure they haven't moved or disappeared on you. Just maintaining a good directory isn't enough. New content and links must be added to keep your directory fresh , to add depth.
Directories can take a life of their own .
You may find yours expanding in ways you hadn't considered before. Explore changing formats. Variety the Spice of WebLife Below are the directories used to illustrate my point. Some have all the elements of a good basic directory , some don't. Have fun, get inspired, see what works and what doesn't.