Most of this information has been moved to the eris documentation wiki.
The following docs are maintained here primarily for historical reasons.
old blackcobalt.net docs:
doc/users/whatsnew.txt what's new for users since the switch to oftc-hybrid+bcfixes
doc/users/webchat.bans.txt writing effective banmasks for webchat clients used on blackcobalt
from the hybrid7 doc/ directory:
doc/modes.txt hybrid7 user and channel mode list
doc/modeg.txt information on umode +g/+G CALLERID functionality
doc/operbasics.html blackcobalt operator guide & command reference
doc/kline.txt setting and removing klines on hyb7
doc/hyb7.txt important notes on the oftc-hybrid transition
doc/routing.txt simplistic routing rundown
doc/notes.for.admins some notes for blackcobalt server administrators
doc/users/bchistory.txt a blackcobalt.net timeline
doc/users/daveshistory.html from the old bc www, dave's perspective on the early days