Irssi
Irssi is friggen' cool. Remember to keep cool settings and whatnot here.
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Terminal bell and highlights
Little purple window highlights are good, except when your terminal window is jammed away in the background somewhere. This should help.
/set beep_msg_level = hilight /set bell_beeps = on /set beep_when_away = off /set beep_when_window_active = on /save