Now, this is one cool BlackBerry application.  BerrySilent allows you to stop your BlackBerry Storm from ringing simply by flipping it over.  You can also silence your BlackBerry devices with keyboards with a convenience key.

BerrySilent is $1.99, 50% off the regular price of $3.99 through Thursday, 10/22.  You can pick it up in the RIMarkable App Store here