Remember google notifier? I used to be a big fan and used it regularly, was good till it lasted. The google notifier for the Mac is no longer available and though the Apple Mail client will give you an audible tone to denote arrival of new mail – I love the Gmail interface and love to use it.
Notify 2 is a fabulous piece of software designed for the mac that notifies you whenever you’ve got mail! and it does it with so much style that you wouldn’t go back to your mail client. Also you can reply and compose message quickly and zap them off in no time! I have a review here and would definitely recommend the $10 pro version – though the free version does the job as well as is no slouch.