Hard Drive Cleaning

Sup /tech/

So, what do you guys use to remove history from your computer. I am getting a new computer, and I have files on this I want to completely get rid of. I deleted them with recycle bin, but I know that still leaves traces. What kind of software should I use to get rid of deleted stuff for good?

>>18
1. Yes.
2. 35, not 35 bajillion. Believe it or not, they are not the same number. Also, the DoD disagrees with you: http://www.hipaadvisory.com/tech/disksan.htm .