It's so much easier than http://chat.stackexchange.com/rooms/151/it-security and I know some other Beta sites have similar addresses for their room indexes. Can we, please?
@Iszi, they don't anymore.
SE removed the chat subdomains a while back, no more chat-per-site.
However there is a chat room for ITSec - http://chat.stackexchange.com/rooms/151 (but you already knew that :) ).