If you don’t need your lips healed right away, some vaseline (petroleum jelly) on your lips (and hands, and knees, and elbows) at night, then sleep on it, will soften up your lips incredibly.
Also, don’t waste your money on Aquaphor. Its active ingredient is petroleum jelly with fillers. :P
I would like to second (?) Carmex, Burt’s Bees, Blistex and Chapstick as good for maintenance. However, something in a tube or pot is best for chapped lips, so that you can glop it on. :D
If you like flavored stuff, Bonne Bell makes Lip Smackers that are well-flavored and easy to use. They also work surprisingly well, considering how cheap they are. The two things that worked while I was on Accutane (chapped lips OMG) were squeezy Carmex (cherry flavor!) and the extra big Tropical Punch Bonne Bell. (Stay away from the cola flavors, however—they tend to burn lips while chapped.)