Well, I already have compsys's source code. It is very raw, but then what do you expect for $23.- ? It only works with small SD card sizes, and it only works with 1 file. Definitely not a wholesome SD filesystem library.

The SD card tutorial is well ... in Italian ... which I don't read/speak/understand.

I have ordered the uALFAT dev board and chip to evaluate.

However I really don't want to add the chipcount (means more power consumption, and board space).