The only trouble with most comercial software that does this is that most of them do 3 processes/jobs, 1) writing 0x00(zeroing out) 2) writing 0xff(filling up free space) 3) writing random numbers. It's most certainly like defragging only takes a lot longer, so i guess you probably wouldn't do it too often and having something like a right click context menu in IE may only get in the way.