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Evidence Eliminator by Robin Hood Software is one of my two top picks. Evidence Eliminator (EE) is a light weight program (~5mb) that will securely erase files on your hard drive with a single click of a button. EE takes simplicity to a new level. With the click of one button, EE runs through deleting a laundry list of files and locations where temporary may be stored, such as the SWAP space, temp files, browsing history, etc. EE will also delete unused space – which is especially useful. In addition to this, you can set up your own custom lists of files or directories to securely delete.
According to one report by researchers from the University of Nevada at Las Vegas and the SANS Institute, Evidence Eliminator was the only tool out of six popular secure delete\erase tools to entirely eliminate any recoverable evidence during a file based wipe.
Evidence Eliminator is licensed on a per PC basis and is available from http://www.evidence-eliminator.com/ for $150. One particularly nice things is that once a license is purchased, upgrades are available at no cost for the life of the product.