CrossFit
For the Murph, I do the traditional pull-up (palms facing away from me), and I go all the way down, and all the way up. I start out touching my chest to the bar on the up, and as i get more fatigued, I just get my chin up over the bar.
As far as the modified pull-ups (kipping), this is something that is promoted in some fitness circles. The Cross-Fit group being one of them. This group is dedicated to total body workouts for power, endurance, strength, stamina, as well as cardiovascular improvements. They claim that the kipping pull-ups help to develop the coordination for other power lifting movements like the Clean, and the Snatch; which they also promote in their WOD. I do both. When I do the Murph, I do the standard pull-up. For other Cross-Fit WOD, I do the kipping pull-ups. Both are good exercises depending on what you are trying to obtain.
It is very interesting which kinds of athletes seem to be benefiting from the Cross-Fit "Workout Of the Day" or WOD. Many athletes that are involved in mixed martial arts competitive fighting are using the Cross-Fit WOD as part of their weekly fitness routine. Many police and fire departments are also incorporating the Cross-Fit program into their training routines. Seems the WOD is a great way to train your body and mind to be ready for the fight of your life. Many people in the military SF community are also using the Cross-Fit WOD to keep themselves in top fighting shape.
If you are interested in getting yourself in the best shape of your life, consider trying the WOD as prescribed on the Cross-Fit web page located here:
http://www.crossfit.com/ It may not give you the super-body builder physique that so many girly men seem to be after these days (so they can admire themselves in the mirror) but it will get you in a real functional fit for life shape so you can survive many of life's real challenges.
A word of caution, if you are not conditioned to this type of physical training, do not attempt to jump right in with WOD as it is prescribed. Start at a level you are comfortable with, and work your way up. There is also a section that has videos of all the Cross-Fit exercises so you can learn how to perform them. This really is a great fitness resource, and the best part of it is the price. Free-99!
Stay fit for life, and enjoy life to its fullest!