Need to quickly look up a phone number or get an address for a letter? iAddressX displays a list of your Address Book entries in the menu bar, providing a shortcut to this information from any application. It displays entries sorted by groups. You can choose which groups to include and specify what information to show in the menu.
Copy phone numbers or addresses to the Clipboard or paste them directly into the front-most application with a single click.
A good, if basic, program to display address entries in the Menu bar