Ever accidentally delete a file you really needed from the recycle bin? Ever format a disk and install a new operating system only to find later that you forgot to save off some really important files first? The former recently happened to us here at the Univeristy in Mzuzu... we thought doom was upon us until we stumbled upon a open (free to change, use, and distribute) software utility called Sleuthkit (http://www.sleuthkit.org).
When we realized our disaster, we started searching Google for "data recovery", "recover my files", etc. Listings appeared for companies charging hundreds of dollars for data recovery services and software. We tried some of the trial versions of the commercial software, but nothing was able to detect our files. Finally one of us here in the office in Mzuzu stumbled upon Sleuthkit, an amazing utility that was able to recover out deleted files from a formatted disk and didn't cost us a penny!