PhotoFast, the people who brought you the microSD Compact Flash Adapter, have done it again with the CR-5500 JBOD USB Flash adapter. At one end it’s a normal USB flash drive, at the other end, it’s a 4-stacker microSD array. Just stick in up to four, formatted microSDHC cards (they can even be different sizes) and using the JBOD (just a bunch of discs) protocol, they’ll magically appear as a single USB drive. No drivers, no worries, works with Windows XP, Vista and 7. ~US$64 from GeekStuff4U
The CR-5500 is not your average microSD card reader hidden in USB thumbkey, but it is in fact a 4 slot microSDHC card reader that will turn all your cards into a single USB Drive using JBOD (Just A Bunch Of Disks) setting and let you build your very one 64GB (Max) USB thumbkey.