“Lookup phone number”
Lookup for a phone number in Address Book contacts

AddressBook Maps plugin v. 1.0 - Mac OS X
AddressBook plugin for Mappy, Pagine Bianche, Tuttocittà.

Place Skype calls from Address Book (opensource, v. 1.1)
Place a Skype call, adding -if necessary- default international prefix

Address Book and TomTom Contacts (v. 1.0 - Mac OS X)
Address Book script and plugin to transfer contacts on the Tom Tom

Place X-Lite phone call from Address Book (opensource, v. 1.1)
An Address Book plug-in to place X-Lite phone calls