MacGeekery has posted a piece 
on smart mailboxes.
It explains what smart mailboxes are, how they don’t really “contain” emails and how, in fact, they don’t even really exist.
It also shows you how to use them to search your email most efficiently and quickly by using information stored in Mail’s own database rather than relying on Spotlight.
After digesting that, you could move on to Joe Kissell’s MacWorld article on Smart Mailboxes for more tips and tricks.
[Via TUAW ]
