In a round-about way. You can pull down the notification bar and toggle sound or vibe. If you choose sound, you can then turn it down to nothing with the volume rocker. Or you can do it the easy way with "Ringer Toggle Widget" (free) from the market. Just put the widget on your home screen and you can toggle between silent, vibe or sound. Another app I use is "AudioManager" (free version with ads or paid Pro version without) which allows you to set all the sound levels independently and choose vibe with them or not. - MarkC