Is your hatchet in need of a quick tuning? Doesn't quite get the job done anymore? It's time to sharpen it. This also applies to sharpening an axe.
Watch to see how to sharpen a hatchet. See how to make the hatchet's blade hold its edge. It's simple, and you only need a file and some WD-40. That's it. The WD-40 keeps the rust off and the file sharpens the edge to the best degree. Make sure you don't put too much of an angle on the file while sharpening, or it will only be good for a few chops.
Kwikshowmehow2 is a great resource for anything DIY. On their site, they present howto information for the growing do-it-yourself crowd in two ways: articles and videos. They strive to keep how-to information eminently usable for any level of do-it-yourselfer, from novice to old hand.