“miniMail 2.0 retains all the goodness of the original–the ability to minimize Mail.app’s interface like you can in iTunes–but adds more features and flexibility.
The minimised interface is elegant and efficient, as you would expect from the developer of MailTags.
It is also fully integrated with Mail Act-on, allowing you to use the same keystrokes to file messages away quickly.”
Seems very interesting, though I’d like to see how it compares to Herald (which is compatible with 10.6.2, don’t worry).