My first Android App. I often forget to change back to normal mode once I switch on the silent mode, usually during movies or meetings. This app allows me to choose a timeout of 10 minutes, 30 minutes and 1-2-3 hours after which the silent mode will be automatically disabled. It also sends an SMS to the missed callers with time at which my phone will come out of silent mode. This way they know when would be good time to call me back. It is possible to disable sending sms completely or to just sent it for people in your address book.
Update Added ability to create notification based on muffler smses. Basically if you call someone whose phone is on silent, the app will read the auto sms and create a notification which will show up exactly at the time that persons phone comes out of silent mode. Instead of you waiting, the app waits on your behalf and lets you know that now is the time. Moreover, the notification can be clicked to directly dial without going back to address book or call records.