Rolfing is a "form of bodywork" that "enables the body to regain the natural integrity of its form" and can "dramatically alter a person's posture and structure", according to http://www.rolf.org/about.
Much of the language they use to describe it is also used by proponents of what I consider to be scams (homeopathy, for example). Thus, while I'm sure that Rolfing has some positive benefits (most people react positively to massages and the like) I'm skeptical about their claims on posture specifically.
The term "Rolfing" is the nickname that many clients and practitioners give this work. It is now a registered service mark in 38 countries.