Nuelectronics.com datalogger shield: Write SD card

Has anyone got this to work? Anyone managed to write to an SD card inserted into the nuelectronics.com datalogging shield? If you have, are your experiences in line with the comments at....

....??

I have an early version of a somewhat modified version of the demo program which seems to work... but I found I had to add things, and am hoping that I've been over-cautious/ confused.

I'm using the recommended Petit FAT File System Module from...

... and the software from Nuelectronics (for the low level "disk access" routines)

The page...

... was revised 09 Jul 2010, 7am New York City time, to include a draft of some code to write to an SD card. NOT well tested, NOT fully robust... but a starting point, if others are on this journey.