I have Blackberry curve... and i already synch my itunes with it..
just download the pocketmac synch manager from blackberry sites.. its free.
install it.... plug the usb into the blackberry and your mac.
press the blackberry icon..then you will see the option like follow:
Status, Contact, Calender, Tasks, Notes, Bookmarks, Email, REdelivery, iTunes, iPhoto, and connection.
so its not only the iTunes.. you can also synch the above selection..
just try it...