Stick Destroyer by John Jarvis
From the description of the April 2013 BBLISA meeting at http://www.standalone-sysadmin.com/bl...
"John Jarvis talked to us about a creative use for his Raspberry Pi - he securely erases flash media using Stick Destroyer. He rigged up a light so that you have a nice visual indicator of when the stick is being erased, and when it's done."