ZylBot is a failing system... and will probably be replaced.
Still, in the event that ZylBot is actually, really, undoubtedly, working, you can type:
ZylBot: Channelstats
To see some more statistics.
I'm looking into a Perl based system that will create some cool statistics... but, I need to find a good logbot first that uses an mIRC type format...
(I was also going to poke Nathan about logging the chat publicly... not sure if thats a good idea or not.)