Hack a Day have posted a quick quide on how you can recover data from an unmountable SD card in a safe and fairly easy manner.  With the use of sandpaper, solder and enamelled wire you can hook up the VSS and VCC pins to a NAND reader, as long as there is a working controller on the card and no physical shorts.  If you don't happen to have a NAND reader, they link to a project that will show you how to build your own, or you can source it from a supplier.  Once you have read the data you can flash it to another SD card or learn about how to translate the content if you have the tools.  Check out the comments for more and keep an eye out for a follow up article on working with the recovered data.

"If you ever find yourself in need of an SD card recovery tool you could always roll your own DIY NAND reader. We will likely give this process a try just to play round with the concept. Hopefully we’ll never need to do SD card recovery!"

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