Once upon a time, Google undercut its own infant OS by offering rival platforms some of the best features of Android. Those days are long gone, and once again -- as much as we love Google Maps Navigation -- the poster child for only-on-Android functionality (in the US) is Google Voice. That's because as of this week, the Android version supports push notification of incoming messages in real time, as well as a neat interface for your reply (as evidenced by the above pic). Feel free to tease your iPhone and Pre-addicted friends, people; multitasking or no, they're n