Here are some of the support files that I have found useful for John the Ripper. More should go up here once I get off my lazy butt and upload them.
John the Ripper Tutorials - Some tutorials on how to use and install John the Ripper
MiddleChild - A tool used to apply dictionary mangling rules to brute force guesses. It probably could be better implemented as an -external mode...
John the Ripper + Cain&Able Play Nice - A tool to extract password guesses from John the Ripper and Cain&Able cracked password files