I know that
Norman has a harddrive wiper which was tested by the feds, but I'm not sure where you can buy it...
It's not listed at their webshop, nor any mention of it one their site...
The reason I know about it was that I was there for an interview, and was told about it as I would have to support that program too...
On a side note, I'm not quite sure how easy it'd be for a private person to get a hold of software like the one from Norman... If you're a psychiatrist or doctor or something like that, yes, but then you
need such software for when you're throwing your old computer away, but not if you're just a guy downloading pr0n from the net... (Unless it's child porn, and then.........!!!!!!!!!!!)
[EDIT]
Just to clarify.. I'm not saying rbuck is downloading child porn or anything like that!
My point was that most programs which erases a harddrive won't be able to withstand the most determined law enforcment agencies, but are easily available on the market for anyone... Those programs that does stand up to those law enforment agencies isn't as easily available, as most people has no need for such protection, unless they're doing something really illegal...
[/EDIT]