if you just want to log data (and not necessarily read it) i have an sdlogging library that saves to fat16 formatted SD cards. i use it to log GPS & sensor data: http://www.ladyada.net/make/gpsshield/download.html
If i look at your pics, especially those close-ups of your shield makes me realise that i need more than a few pins and cables to connect the card to the arduino..
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