VoiceSignal has a new application that lets users navigate through their iPhone's menus with voice commands. Does it really work?I don't know, but it makes me wish I hadn't returned my iPhone last month. From what I can tell, though, the VoiceSignal app is designed to work with the iPod part of the iPhone. Users can literally speak the name of a song or artist to navigate to their music. Check out this video on Gizmodo to see the app in action. What do you think? Do you think it actually works?