At the time of release this app is still limited to participants of the GrandCentral beta. Bummer huh.

Vocito is essentially a quick dialer that lets you dial your phone directly from your desktop. Vocito is also integrated into Address Book, QuickSilver, and Automator, and is fully AppleScriptable. The AppleScript connection makes it easy to have Vocito automatically dial your phone from just about any application that supports scripting or Automator actions. For example, you can easily set up your iCal meeting appointment to automatically dial the conference call for you at the correct time.

You can find the whole story here: Google Mac Blog

While still very fresh, it seems as though once this program takes of it will be very popular and simplify many aspects of our lives.