Below is a small project, I combined Dave Hine's filetest.c, and an RTC example provided by jazzed into a program called PropCS.
I am running this on a C3 board with the board setting of "C3F-SDXMMC", and a memory model of "XMMC". This should be run using the 'Run Console' method. For an explanation of the available commands, use, as an example 'manecho' which gives a brief explanation for the 'echo' command. If you type 'help' it will list the available commands.
I wanted to test out using the uSD card as an extended program space. Since the program itself is fairly small the program response time is very good, which surprised me.
I would appreciate it if everybody would run this program to see what bugs they run into, or other problems with the program.
Have at it.
<edit1> 4/12/2012 ***WARNING*** This version of PropCS is a Proof Of Concept (POC) version. For the non-regulars here, this was created to check and see if program space on a uSD/SD card does in fact work. So, far it works for me, and I am using the C3 board at the moment.