Installed Growl and GrowlMail today. LOVE THEM! Anyway, my gmail is configured with custom labels, which IMAP detects as "folders". For example, any time my gmail account gets a facebook mail, it labels the message as "Facebook". This is great, but GrowlMail shows TWO Growl messages. One for the message coming into "Inbox" and another to the message coming into the "Facebook" folder. This is my theory. Otherwise, I have no idea why I'm seeing multiple Growl alerts for emails that are moved/labeled.