Really need something that can scrub the address book for duplicates. As I use sync, it randomly duplicates addresses to the point where about 30% of my address book are duplicate entries. Oddly enough, Address Book leaves some entries alone while other will be duplicated 5 or 6 times… identical entries.
The address book duplicate finder cannot be trusted as it will combine "Bob R. Smith" and "Bob R. Smith" even when they have different email addresses. (aka the unique identifier of the email address is different and they are different people with other information in the vCard differing as well)