Google Voice for Android has been updated to version 0.4.2.54 that brings visual voicemail integration for the devices that runs on Android 4.0 (Ice Cream Sandwich). You can also access access folders from the inbox in Android 4.0 directly.
The voicemail intergration lets you view and listen to your voicemails on demand directly from the call log on your Android phone in phone’s call log. You can also slow down the playback, or you even speed playback up. You turn it on from Voicemail display, under settings in the devices that runs on Android 4.0.
Download Google Voice for Android from the Google Play Store for free.