From Joe Levy:
GVoice is a Google Voice app for Windows 8 that lets you view your Google Voice inbox, texts, voicemails, and calls at the touch of a finger. Send text messages to your friends with ease, and get notified when they text you back. Initiate calls from one of your phones to any phone number. It features receive notifications when you receive new text messages and voicemails, send text messages to your Google and Windows 8 contacts, create new Google contacts from unrecognized numbers, change the photos of your existing Google contacts, view your text message conversations in detail, listen to your voicemails and read voicemail transcriptions, configure push notifications to receive text and voicemail notifications instantly, and initiate phone calls from one of your phones to any other number.