New iPhone and iPod touch owners, did you know that holding down the Home button for three seconds at any time - including when the screen is off - activates your device’s Voice Control mode? Wait for the beep, then say “Play songs by The Beatles.” Your iPod or iPhone will recognize your voice and say, “Playing songs by The Beatles,” then start playback. This works on the iPhone 3GS, iPhone 4, iPod touch 3G (using microphone…