Internal system/network documentation

Is anyone intersted in discussing the elaboration and mantainance of documentation about internal systems and networks. This is most useful in multi-administrator environments to to define policies, standards and procedures.

What features should be included (usernames & passwords rules, printer & storage management, backup & security policy, etc)?

Should a problem/solution log would be nice be kept? How to update the manual and record changes to it? What media supports are better?

Ok folks, what have you to say about this?

Regards.