It's not a vital issue, but it is getting annoying. Every time iChat is about to do something, including beep, bounce in the dock, or have a buddy logon/off, my speakers click, about 1.5 seconds before anything happens on my screen. It sounds like a single contraction of the diaphragm of the speakers, but I have no idea what's causing it, or why it happens one and a half seconds before something happens in iChat.