Meeting Silencer Automatically turns your Android Smartphone to Silent Mode whenever there is Meeting Time and back to Normal Mode when Meeting is over. All you have to do is create a Event or a Meeting Invitation with name of Meeting(case-sensitive). You you also stop the service any time from User Interface.
http://market.android.com/details?id=com.seal.meetingsilencer
http://market.android.com/details?id=com.seal.meetingsilencer