Get rid of your Baywatch pr0n (& all the rest)

Just found this program, called DBAN, that seems rather cool to delete all the HDD data before selling it.

It is free, GPL licensed.

Darik's Boot and Nuke ("DBAN") is a self-contained boot floppy that securely
wipes the hard disks of most computers. DBAN will automatically and completely
delete the contents of any hard disk that it can detect, which makes it an
appropriate utility for bulk or emergency data destruction.