htc droid incredible - Is it possible to only silence certain notifications?

I'm running Android 2.2 FroYo on an HTC Droid Incredible. When I go to bed, I want to turn off all notifications except for incoming phone calls, which I still want to receive. Is this possible, either natively or through an application?

Answer

I asked this question to a friend and he suggested the AudioManager Widget. It allows you to control volumes for Alarm, Media, Alerts, Ringer, System, and Voice Calls independently. It also allows you to toggle vibrate for alerts and ringer independently. So far, it seems to be a solid app.