For Z(V) 800 users with 10.3.x try this:
http://www.macosxhints.com/article.php?story=20041118143359172&query=v800
After this syncing with adressbook and iCal worked, but no dialing or smsing from adressbook.
In 10.4 the phone is supported with the exception of dialing and smsing.
For that do this:
1. Quit and backup your Address Book app... bla bla bla ...
2. Control click on the Address Book app, select Show Package Contents, then navigate to Contents -> Resources.
3. Control click on Telephony.bundle, Show Package Contents, then navigate to Contents -> Resources
4. Open ABDeviceCommandSets.plist with Property List Editor (or a text editor to change the XML in a more primitive way)
5. Find this array in the ABDeviceCommandSets.plist: Root -> 1 -> ABDeviceModelStrings ... you should see two string entries here, T610 and Z600. Add another string entry, or change one that you will not use with the value V800. Save and quit
Now relaunch Address book. SMS and dialing may now work with your V800.
As always: before you do anything, backup, backup,.......
and pair from the phone to the mac FIRST.
You must use bluetooth, USB is for iPhoto to transfer your pictures.
Michael