Comment Self-Documenting? (Score 1) 528
Am I the only one who first thought, "If you have done the network correctly, it should explain itself"?
Overly-complex networks take overly-complex documentation and overly-complex people to run and maintain. Mind you, there's a difference between correctly-complex and incorrectly-complex, but at the same time, every level of difficulty you go upwards in the configuration scale you exponentially increase the need for carefully calculated and layed-out systems.
Ok, ok...now that I'm thrust back into reality...and given that you aren't likely to rebuild your network (although you might consider some re-work to help the self-explanatory aspect)...
High level details, locations of closets, routers, switches, major cable runs, passwords, IPs, big details. All the small things the other person will have to figure out anyway and catalogue in their own mind in their own way, so doing it for them won't help a ton. Give them the tools to do their job properly and you'll be sitting fine.