Google Voice for Android updated - now with widgets!
The second widget, Settings, might be even more useful. It shows your credit balance, and has 4 useful settings buttons. There's one to open the Google Voice app, one to compose a text message, one to change your dialing settings, and a fourth to toggle Do Not Disturb mode on and off.
That last one is a real winner if you've been afraid to turn on Do Not Disturb (which sends your Voice calls straight to voicemail) because you wouldn't remember to turn it off. Now it's right in front of you, so you can use it with impunity.