SmartBook brings Smart Groups to the Apple Address Book. Smart Groups are to the Address Book what Smart Playlists are to iTunes. They allow you to have groups that update automatically according to a set of rules you can setup with SmartBook.
What's new in SmartBook
Added ability to not show the Agent in the menu bar.
Improved agent starting/stopping.
In the rules editor: renamed the 'matches' field to 'starts with' which reflects more appropriately the functionality.
Added italian localization (more localized versions will soon be available via Check for Updates).