I am in the process of revising the library section of my guide to include special collections. If you know of special collections or special subject strengths I should include, please drop me a note. Like the network itself it really isn't very easy to navigate - in spite of its deceptively simple hierarchical structure. Many of the best resources are hidden from view while much of the dreck is endlessly repeated on server after server. It is intended for the makers, keepers, and users of these resources.
Hierarchies work best if they are based on some sort of logic that is apparent to the user.
Materials on any public information system need to be updated regularly. A job listing from last December may have archival value but is of little current interest to most users. Think about including expiration dates for information on your system that is subject to change. Documents should be have author, title, date, and source. Remember that in many cases authors of network information will provide updates if they are asked.