USB cable is supplied.
Download Dreamsicle, as well as K750i Grabber.
Dreamsicle is a friendly user interface, and the demo just limits how many songs you can transfer at a time (10).
K750i Grabber fixes a problem in which disconnecting the phone causes your mac to have a kernel panic.
I recommend this as the best method. You can view the phone's card via The Finder but this is easier.