Free, easy to use prog, not too advanced: http://www.pcinspector.de/smart_media_recovery/uk/welcome.htm∞
TestDisk (hardcore, better for hdds but works on flash too): http://www.cgsecurity.org/testdisk.html∞
PhotoRec (not just for pictures, good at recovering post accidental format etc): http://www.cgsecurity.org/photorec.html∞

Cool free encryption (windows tied in): http://axcrypt.sourceforge.net/∞

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CategoryHowTo