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A Taiwanese company has made coinjoined twins out of SD and USB. It's called the PsD or Personal Storage Disc. One half is a regular SD memory card—slot it in and load it up. Ready to transfer to a PC? No need for an external SD card reader, or to rely on Bluetooth discoverability. Just take the top half of the PsD apart and it can be plugged straight into a USB port. I suppose fitting it right in the middle of that USB slot might be a problem, but this is a pretty boss solution for a nagging problem. The sample shown here is 2GB, but there is zero info on pricing or availability.

Memory Card or USB ?, Dont Choose, get a 2 in 1 [Phoneyworld]