I’m already a lover of Spanning Sync, version 2 promises to have contact syncing between all your Google apps with the Mac address book. This could be very very good. Check the link for a video of it in action.
People know Spanning Sync for its ability to sync Apple iCal with Google Calendar. In fact, more than 70,000 people have used Spanning Sync to do just that. But calendars are only one part of the equation.
Our users tell us that they also need to be able to sync their Mac Address Book with their contacts in Gmail and Google Apps. So Spanning Sync 2.0 does both calendars and contacts.