Notification when new email received

FROM : Steve Cronin
DATE : Sun Nov 18 20:42:30 2007

Folks;

I've checked around and I don't see any formal means to be notified 
when a new piece of email is received.
Yes, I do realize the general problem of the many different mail 
clients but my interest is (for now) in Mail.app.

Given that, what would be the general counsel for best way to keep up-
to-date with new mail?

I have the AppleScript to get unread counts from any desired 
mailbox,  I'm thinking I should just run this AppleScript using NSTimer.

Am I missing something better in Cocoa?  (This is Tiger BTW  - 
Leopard only leaves too many customers out in the cold for now...)

Is there a better design approach?

Thank-you for any thoughts on this matter!
Steve