GVdialer is an intriguing mobile application for Google Voice, supporting iPhone, BlackBerry, Android, Microsoft, and Symbian. GVdialer enables you to use Google Voice with your mobile phone while enabling some cool features. For instance, you can present your Google number as your Caller ID on outgoing mobile calls, thus keeping your mobile number private. This also gives you a one number identity to share with people.

Using the app installed you can dial directly from your phone's contacts, speed dial, call log or keypad, and GVdialer will automatically connect the call using Google Voice.

Even cooler you have Google Voice feature access including instant access to Google Voice's voice mail, Inbox, and GOOG-411.

As seen in the iPhone application, GVdialer lets you configure when GV would be used, i.e. on all calls, international calls, domestic calls, or ask on every call.

It costs $9.99, but definitely worth checking out