How about an iPhone mute function with a timer feature?
<p style="white-space: pre-wrap;">Here's an idea for an iPhone feature I'd love to see: a mute feature with a timer. Let me explain. I'm going to a meeting, church service, etc., so I set my iPhone's volume to vibrate only. After all, you don't want to get a phone call when the boss is on a tear or the preacher's really into his lesson.</p>