◉◎◉ iOn Internet Status lets you know if your MAC is connected to internet or not. Get real time connection status of your Internet(Network) right from the menu bar and with sound alert. This utility adds a neat color (Green/Yellow/Red) icon on the menu bar which lets you know the status of...
I use Growl and Hardwaregrowler together. HWG has Airport notifications as well as other stuff, and Growl in general is just very handy. You can even set them to behave like native notifications, or their older original styles