Using AVR as a data logging system is cool, but data storage is a great problem as external eeprom or flash memory may be too small and expensive. I guess most of us have some 16MB and smaller SD card on your desk because nowadays you are using 2G SD cards on your camera!
Here are some links may useful:
http://www.captain.at/electronic-atmega-mmc.php
http://www.avrfreaks.net/index.php?name=PNphpBB2&file=printview&t=61851&start=0
http://www.roland-riegel.de/sd-reader/doc/index.html
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