I'm a big fan of sharp knives. I really hate dull knives. (Don't ask me why I still have some of the garbage in the knife drawer, because the only potential answer I can think of is laziness.)
A while back I went looking for a good way to sharpen knives and the plenty of information about it. Steve's Knife Sharpening Site is the best information I have found on the topic. If you've got dull knives, and want to do something about it, this is the place to start.