Hey all - been playing with the Mark IV since Shmoocon... Love it!
While out and about yesterday, I picked up one of these wonderful little SanDisk Cruzer Fit drives:
http://www.sandisk.com/products/usb-flash-drives/cruzer-fit-usb-flash-drive
This thing is no bigger than a thumbnail, and I got 16 GB for $12.00 on sale yesterday.
Given that this is so small, how easy would it be to integrate into the board on the Mark III/Mark IV, and still give us a USB port?