As Google has not yet released its Windows mobile version of Google Voice, but here is a simple free application called gVo which is the best variant for official Google Voice dialer for Windows Mobile. You must have .NET3.5 installed for this utility to work properly. It can select the contacts from the list and dial the number.

Features:

• Select contact and dials their Number (Mobile)
• Enter in a non-contact number and dials;
• VGA Only;
• Skin support;
• Limited landscape support;
• Calling Card Method;
• Google Online Functions – SMS/CallBack/Inbox/Voicemail (NEW)

Download gVo