A new version of SdFat is available as sdfatlib20121217.zip http://code.google.com/p/sdfatlib/downloads/list
This version supports AVR boards, Arduino Due, and Teensy 3.0.
There are many changes so please read the changes.txt file.
Note the following change:
The default for ALLOW_DEPRECATED_FUNCTIONS has been changed to
false. If you get compile errors for these functions, either
change to the prefered replacement function indicated in the
error message or set ALLOW_DEPRECATED_FUNCTIONS nonzero.
A key change was to remove sd.init(spiRateID, chipSelect) in favor of
sd.begin(chipSelect, spiRateID). The difference between these two is
the order of the arguments which has caused serious confusion at times.
A number of configuration options can be set by editing SdFatConfig.h
#define macros. Options include:
ALLOW_DEPRECATED_FUNCTIONS - enable or disable deprecated functions.
Deprecated functions will be removed in a future version of SdFat.