So here's a general *programming* introduction to what the different modules do
and what services they provide.  It is, however, only an introduction.  Read
the modules themselves for a much more detailed explanation :)

fix.py: Stuff that Python should (but doesn't) include by default.

cdb.py: A constant database library, translated from C (and my O'Caml version)
        More information available at http://cr.yp.to/cdb.html.  Not
        currently used since we switched to PySQLite.

ansi.py: Contains different ANSI color sequences.
         Mostly used by the debug module.

debug.py: Functions for handling bugs and errors in a consistent manner
          throughout the bot.

conf.py: The configuration file for the bot -- it sets a lot of variables that
         other modules check for when they have questions about what they need
         to do.

world.py: Just a dropping off place for some globals that need to be shared
          among all the modules.  It's obviously not used *a lot*, but some
          things seem to fit better here than anywhere else.

template.py: A template used by setup.py to create customized runnable
             Python scripts for individual bots.

privmsgs.py: Basic stuff relating to callbacks.Privmsg, the base class
             for most plugins.

callbacks.py: A few basic callbacks providing significant functionality.  
              You'll likely be inheriting from Privmsg quite a bit.

ircdb.py: The users and channels databases are here, as well as the
          IrcUser and IrcChannel classes.  Look here when you want to
          restrict a command to only certain users.

irclib.py: Provides the most important class in the irclib, Irc.  It represents
           a connection to an IRC server, but it's entirely separate from the
           network implementation.  It's connected to the network (or whatever
           else drives it) by a "driver" module which uses its feedMsg/takeMsg
           functions.

drivers.py: The baseclass (IrcDriver) for various drivers to drive irclib.Irc
            classes.  Also, the driving mechanism.

asyncoreDrivers.py: The asyncore-based drivers for use with the bot.

socketDrivers.py: The plain old socket-based drivers for use with the
                  bot.

twistedDrivers.py: The Twisted <http://www.twistedmatrix.com/> drivers
                   for use with the bot.

ircmsgs.py: The IrcMsg class (get to know it :)) and various functions for
            making the creation of IrcMsgs easier.

ircutils.py: Various utility functions for Irc -- read the module to see what
             goodies are there :)

schedule.py: A schedule driver (which is automatically registered with the
             drivers module) to run things at a particular time, or at
             specified periods of time.