OK, so the code that i'm using is available here. It is the MDD file system for SD cards from Microchip, but only some of the files are developed for the dsPIC. "demonstration.c" needs to be ported to the dsPIC, and "hardwareprofile.c" needs to be matched to the design.
I have the code written for my design, but I'm not necessarily looking for help with the code, just to see if anyone else has experimented with the dsPIC and SD card using the MDD file system.