I clicked the link, I saw something I might like and would use but I found absolutely no instructions or information on how to actually use the downloaded archive. Is it mac only? How do you run it?
On this note, maybe someone want's to program an application that would select random unused portions of hdd and write random data to them? Something like a daemon/windows service that would take care of the data that hasn't been fully purged by os delete. I would do it myself, but I lack knowledge in low level api's