Hard Drive Sanitizer
I came across a good, free utility to securely (for my purposes) erase a hard drive. It’s called “Darik’s Boot and Nuke” and is available at http://dban.sourceforge.net/.
UPDATE: Perhaps a better solution is to use something I already have. A bootable linux CD with the “shred” utility. The knoppix live CD has this program. For instructions on how to do this, click HERE.