Google voice has got a nice and useful upgrade now. Google Voice Is Now Adding Direct Integration With Android Ice Cream Sandwich(v4.0)'s Visual Voice Mail. This allows you to grab any Google Voice Voice Mails right inside the visual Voice Mails view of your ICS device without going to Google Voice's Application.
Without this update, users were able to get their Voice Mails in a nice Visual Interface included in App itself. But through this update, you can see those mails, in the Visual Interface of Android Ice Cream Sandwich. Google Adds in Google Voice's Official Blog that
Your Voice Mail will appear alongside your outgoing, incoming, and missed calls in your phone’s call log and you can just simply touch them to play them. You can slow down the playback of the message which is great for when someone is telling you their callback number, or you even speed playback up, so you can quickly listen to longer messages.
You Can download this Latest Version From Google Play Or Just Grab The Update.