Haptic Clock tells time via vibrations
Remember old grandfather clocks that chime every quarter of an hour and at the turn of each hour? For those who want a similar principle in their cellphones, they can always download up the Haptic Clock software for Java-enabled phones. It tells you the time via a series of vibrations - all you need to do is press the 5 key. Long vibrations denote the number of hours of the current time on a 12-hour clock, while the shorter vibrations denote the number of minutes divided by 5. For example, 8 vibrations means 40 minutes past the hour, while a couple of vibrations is a mere 10 minutes. Best of all is, this software is free, making it an essential download for those who have long ditched their watch in favor of a cellphone.
SOURCE LINK
http://cwwang.com/wordpress/2007/05/24/haptic-clock/
http://www.ubergizmo.com/15/archives/2007/06/haptic_clock_tells_time_via_vibrations.html