Have a look at your incoming email without switching to Mail. Mail.appetizer is a plug-in for Apple's Mail and integrates seamlessly. The moment a new message is received, Mail.appetizer displays an onscreen notification window. It gives you a brief summary of the message, so you can determine whether the message requires your immediate attention.
Features:
* Resizable notification window to fit your desktop.
* Custom font for the message body.
* Displays sender's photo signature (from Address Book or .Mac).
* Counter showing number of outstanding messages.
* Shows mailbox name (optionally).
Mail.appetizer is not limited to your inbox. You'll receive notification for every incoming message, not including spam. The notification is shown after rules have been applied.