for gpg at the command line do:
Code:
gpg --edit-key <your_key>
once you are int he edit section, do:
follow the instructions and add your new email address in there. now you will have two email addresses listed. you can opt to keep them both, or delete the other one.
as for an IRC client, that depends on if you use Ubuntu or Kubuntu. Kubuntu I would recommend Konversation. With Ubuntu, either use GAIM or X-Chat.
hope this helps, if you want more help or anything, i got by nixternal on every chat client you can think of
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