What is the best HDD secure cleaner/wiper?

Gentlemen, what to use to securely wipe / clean a HDD so that even 'modern forensics' will never read it (apart from using a hammer).

Deriks boot'n Nuke!!!!!!!!!
Link >> >> Darik's Boot And Nuke | Hard Drive Disk Wipe and Data Clearing
(Warning -- I have not yet tried this software, and it may not completely remove everything,
Also, I think MiniTool Partition Wizard home edition may have the drive wipeing functionality)

(Then install windows and download a whole bunch of extra crap to fill the harddrive, then wipe it AGAIN! (about 4 times over to make sure))
I think this is a surefire way to kill whatever your looking to delete :) May take some time tho...
I see no real reason for this functionality tho unless your giving away a computer, then look up a guide of things to do before giving it away, or just remove the HD and tell them they need to buy one and install windows:)

nah, i think filling it till you cant no more, then wiping it, repeat this about a dozen times and i don't think anyone should be able to get their hands on that file, either that or it'll be EXTREMELY Corrupted and you won't be able to figure out if it's a .exe or a .txt IMHO :)

Thanks all.

You might want to read this.
HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It