Thunderbird Released

A new version of Thunderbird was released a couple days ago (November 14th). Here are the details from the Release Notes:

What’s New in Thunderbird

Release Date:
November 14, 2007
Security Update:
The following security issues have been fixed.
Earlier Changes:
For information about previous changes, please see the Thunderbird Release Notes
Thunderbird 2 Features:
For an overview, please see Thunderbird 2 Features.

The Rumbling Edge has a more detailed list of notable bug fixes.

More info at Mozilla Developer Centre: Thunderbird security and stability release now available