I was at work today, typing away, looking at the various scars on my hands. The vast majority of them were from knife accidents, and only because I did not follow some basic knife safety guidelines. Using what I learned in the Boy Scouts, I wrote up a knife safety article for the wiki. Go take a look, read up, and keep your blood inside your body.
Of course, if you have any other good tips, feel free to create an account and edit the article.