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http://arduino.cc/forum/index.php?topic=53821.0
Use timer1 on Atmega
http://www.electronicsblog.net/exampl...-bit-hardware-timer-for-digital-clock
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http://interface.khm.de/index.php/lab...nts/arduino-frequency-counter-library
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http://allthemods.com/project.php?id=342&page=2
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http://code.google.com/p/sserial2mobile
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http://www.dutchtronix.com/Arduino-ClockShield.htm
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http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1210243556
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http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1197235191