iSparx lets you share information in your Mac OS X Address Book with others on your network. Now you’re able to search for contact information that’s present on any other Mac, running iSparx. Every member of a sharing group in your Address Book application can be searched by others and shared with others.
Sparx takes advantage of Apples’ Rendezvous technology, it will find the other users without any network configuration. Simply run the application on the Macs you want to be able to share Address Books and the service to be active.
iSparx is available now in English, French, and German.
iSparx is $12 shareware for up to 10 buddies, $21.50 for unlimited. More info here.