Well, this feature has been in here for a while and I've never had three people in it at the same time.
CaptainDreamcast and I are use it often.
I like IRC, and use it constantly for various servers and channel.
I'm curious about the lack of people using the Dreamcast-Talk IRC, and if it may be the lack of knowing it "exists".
For people who use IRC with a separate client here is the information:
irc.freenode.net
dctalk
Or for people who don't use a dedicated IRC client, go to the chat page and scroll down, there is a built in client.