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there is an irc channel on freenode named #s4-project

Some connection instructions with Adium, a mac client (there are many other
alternatives of course):

Add account:

server: irc.freenode.net
nickname: yours
then go to File -> Join Group Chat
enter channel: #s4-project
you are in!

in order to automatically connect in Adium :
--> just use the contextual menu on the channel tab and do "bookmark"