Timeriffic – time-based ringer modes
Timeriffic allows you to mute and un-mute the global ringer on your T-Mobile G1 based on the time and day. The default state is setup so that the ringer is turned off between 11:00 PM and 9:00 AM everyday. This happens automatically every night at 11:00 PM and the ringer is turned back on automatically at 9:00 AM every morning. Vibrate mode can be enabled during the time the ringer is off. The actions at the start time and end time are fully customizable and various profiles can be saved for later use based on your preference for both days and the time for each day. So you can configure it to turn the ringer on at 8:00 AM only on Wednesdays instead of the usual 9:00 AM.
This application does with time what Locale does with location. It’s simple, trivial to configure, and once setup you can forget about it.
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You should check out the Motorola Droid