After reading Janq's post on knife penetration, I was thinking of how many people I know who carry dirty, dull, cheap knives. My knives are always wiped clean after cutting anything that will leave a residue on the blade. This residue, even oils from your hand, will eventually stain and corrode the blade's finish. Also, I sharpen my knives frequently. It's easier to keep a sharp knife sharp; it also reduces the amount of blade material removed to get a razor sharp edge. Invest in a knife sharpening kit. For $30-50 bucks you will be able to maintain a great edge on every knife you own.
http://users.ameritech.net/knives/index.htm
http://knifeforums.com
http://users.ameritech.net/knives/index.htm
http://knifeforums.com