For those interested in USB/IAR:
In the recent distribution of IAR EWB-ARM they have a LPC2148 USB
MassStorage example. It implements simultaneously a RAM drive and a MMC/SD
card drive.
It may be available in the EWARM-KS32 32k limited free version:
http://supp.iar.com/Download/SW/?item=EWARM-KS32
The code had been cleaned up a bit from their USB HID example.
Joel