The Toolkit does indeed greatly enhance application dev, and
yes CSS/Ajax is really pushed in here, too (with greatness
regarding standards may I add).. but it also boasts things that
although not directly related to the physical application
development, can improve your experience never the less..
True to the heart data representation, if you are working
with (in your case PHP/MYSQL) you can work with anything from
recordsets to simple php includes functions and have it all
actively be executed and displayed right in the DW workspace with
"Live View"
It connects to Adobe Products seemlessly, heck you can even
take PSDs and import/modifiy/work with them right in Dreamweaver!
MUCH better deployment
Drag n' drop data fields,
gosh the list goes on, it really does. Pick up or go to your
bookstore and look at the section of whats new in DW CS3 in the
book "Wiley Dreamweaver CS3 Bible"