And when was the last time you saw an SD card as small as 2GB?

http://arduino.cc/en/Reference/SDCardNotes
Says:
"The library supports the FAT16 and FAT32 filesystems, but use FAT16 when possible."

What is the reason for this? Is there some problem with using FAT32?

Thanks, that looks like what I wanted.

The Arduino IDE emphasizes reading or writing individual pins, but I'd like to read all of the pins on a port at the same time. I know the chip can do this, but I don't know how to do it from C. Also, is there a handy way to set up all the pins on a port as inputs or outputs rather than using Pinmode on each pin? (Again, from C-- I know it can be done in assembler).

I'm using the Atmega43u4 breakout board from Adafruit, using the slightly modified version of Arduino 21 on this page:
http://ladyada.net/products/atmega32u4breakout/

I want to read data from ports D and F, and then write it to the USB port. (I know two bits of port F are not available on this chip, but that's OK).

It seems like this would be an obvious question, but I haven't seen it discussed anywhere.