Gmail Notifier

For those of you with Gmail accounts, here comes the Gmail Notifier. It's a little program that has an icon that sits in your system tray. When a new mail comes into your Gmail account, a little window rises letting you know that and what the mail says. Nice tool, but it's for Windows only at the moment. I've already downloaded the plugin for Firefox that does almost the same thing. I would hope that Gmail would open their API for other people to use it.