There have been discussions about sharing Address Book contacts through LDAP, and there have been many suggestions such as running OpenLDAP, using .Mac, or running dedicated apps on your Mac.
In this day and age of Google Apps, I would think that someone (Google?) would have come up with a shared LDAP server that is free or low cost.
Yes, there's Plaxo, but it's not LDAP -- standards exist for a reason, and Apple has included LDAP client capabilities...
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