I have found that once you get used to it, sleeping on a hammock is much more comfortable than on the ground. Furthermore, you will never have to worry about a ground tarp, uneven, rocky or wet ground, and can probably eliminate your tent as well as some other gear.
Please note this is a guide for beginners, and does not cover more of the technical aspects of hamocking. If this guide has gotten you interested and you want more information on hammocking I suggest you go to the Hammock Forums, you'll find a ton of completely neurotic and awesome people obsessed with hammocks, with a ton of information on all things hammocks. I'm currently planning revisions for this instructable based on the methods that I learned from HF and now use myself, but for this guide should be adequate.