Apple Addresbook migration question

[dwittenberg2008]

I have a bunch of Mac users, and each one has a bunch of different Addressbooks they are sharing. Right now I'd like to take all of the shared ones and put them under one account, called shared, mainly for centralization. So I have to export a couple different ones from each Addressbook and import that into 'shared'. Since Zimbra import doesn't support vcard or ldif for contact import (why ?) anyone have any thoughts on easy ways? I know all about the iSync connector but that's too much 'all or nothing' for this since I'm picking and choosing.

Thanks,
Dan