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Shush is an app which helps you to deactivate your silent mode after the specific duration you want to leave it silent!
When you want to put your phone to silent mode, simply press volume down button until it turns silent, shush will pop up, asking you how long do you want to keep your phone silent and it will deactivate silent mode after that duration.
Of course, you can also silent it indefinitely!

This app is super good for lectures, classes and meetings or dates. Been a happy user of it and even my iPhone mate was envious of it! It's called Shush! Ringer Restorer and it's free from the Android Market! Be sure to get it!