http://www.softick.com/pocket-pc/cardexport2/
Best bit of software I've found in AGES!
"Card Export II PPC emulates industry standard USB Mass Storage device on Windows Mobile or Pocket PC handhelds.
Quickly install applications to the storage cards or file stores
Fast audio and video content transfer to the cards. Transfer your MP3 files to the cards using Windows Explorer or your favorite file manager.
Use flash card as a floppy for any data
Fast backup and restore of your card content
Perform storage cards maintance. Format flash cards and check filesystem integrity using desktop operation system."
Yep, you read it right - it makes your SD card appear like a memory stick AND you don't need activesync installed on the PC to access it