Keep 'em sharp
I know it's one of those things that people just don't do anymore, but I'd like to recommend that you get your knives sharpened at least once a year. If they were nice knives, don't you want to treat them well? And if they were cheap or used, don't you want to put a few bucks into improving them? It costs about three bucks a knife, and you end up with a lovely, sharp blade.
In Portland, I like to go to Portland Cutlery in downtown (536 SW Broadway). While you're there, you can pick up a great new paring knife for only $6; it's the Victorinox 3" paring knife, and it's a top pick from Cook's Illustrated's. How can you go wrong?
I never even considered doing this. I think I'm afraid that I'd cut myself easier if my knives were actually sharp.
Sharp knives are safer because you hardly put any pressure on the blade; with dull ones, you have to push so hard that if they do slip they'll get you good.