microSD card and USB shield for RFDUINO as a USB flash drive

Is there a project and tutorial that shows how to access the SD card on the SD card shield via USB.
Basically I want to be able to connect my arduino to my PC and access the SD card in a standard file view without taking the SD card and and putting it into the PC's SD card reader.

BUMP. I still haven't made any progress. I tried several different things with no luck. I can get a file directory within the arduino serial monitor, but that's about it.