Why join these, it's going to be infested with script kiddies and you'll get scanned 24/7 with bots looking for vunerabilities... flame wars left and right... No fun.
irc.freenode.net
irc.rizon.net
irc.undernet.org
join channels like #c++, #c, #java, #linux
you can always /list and find good channels in any server too...