The Help file for OS X 10.6.4 (Snow Leopard) Address Book sync to Google Contacts links to this oddly named Google page: Where can I find information about Contact Sync? - Contact Sync Help.
This is what we get.
I'm working up to trying this. Currently I sync my iPhone contacts like this:
- Corporate: to and from Exchange 2007 [1].
- iPhone Personal <-> MobileMe Contacts
There are two additional syncs
- MobileMe <-> OS X Address Book <-> Google Contacts (My Contacts)
The last of these is mediated by Spanning Sync.
Both MobileMe and Spanning Sync cost money. I could easily live without MobileMe Contacts.
So I'm considering either ...
- iPhone Personal <-> OS X Address Book <-> Google Contacts
- iPhone Personal <-> Google Contacts <-> OS X Address Book
Either way the Google Contacts to OS X Address Book would be mediated by Contact Sync.
Remember how easy this all way with the Palm III?
[1] This means my employer can wipe my iPhone at any time. This might or might not delete photos. Everything else is either synchronized or backed up, but a remote wipe would be a pain. Know your risks.