I've begun to notice the audible alert "pop" on my Macbook, but I can't pinpoint what is causing it. I've "quit" all of my Gmail notifiers, so I don't think that's it. I don't have any sound on Adium, so that's not it. THere are no new Mail notifications when I hear the "pop", and Newsfire isn't set to play any sounds at any point. Any ideas? Thanks in advance.