Testdisk — http://www.cgsecurity.org/wiki/TestDisk_Download
ddrescue — http://www.cyberciti.biz/tips/how-do-i-save-recover-data-from-crashed-disks-with-dd-and-ddrescue-command.html
LVM1 — http://www.sulinet.hu/tart/fcikk/Ka/0/25852/1
LVM2 — http://www.sulinet.hu/tart/fcikk/Ka/0/25831/1