HEXUS just posted a video from Computex 2007 with 2 of the most compact flash drives around.  The first is no bigger that the USB plug, and offers up to 4 GB of storage, although we only get to see the 1 GB version, and a second that is the size of a business card, though about twice as thick.  That business card USB drive comes in a 64GB model, and you can customize the outside!
“PQI’s Bruce Lee seduces Nick with 4GB storage devices you can wear as jewellery and 64GB credit card drives for the fellas (or was he just pleased to see us ?)”

Here are some more Storage reviews from around the web:

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