The official forums IRC has changed channel.
Our server is still irc.digibase.ca, the channel is now #fqa
To access via Mibbit, click the following link: http://client00.chat.mibbit.com/?server=irc.digibase.ca&channel=%23fqa
and enter your nick.
Alternatively, go to Mibbit.com
and click 'Server'.
Input server irc.digibase.ca, channel #fqa, nick whatever you choose
If you are already registered, disregard the following part. Otherwise:
To register your nick, enter
/msg nickserv register [password] [email]
Where [password] should be your chosen password (without brackets) and email your email address. Passwords are case-sensitive.
You only need to register once, after that, you can identify using
/msg nickserv identify [password]
The old IRC thread can be found here