Many would-be software entrepreneurs with expertise in many fields attempt to turn a homegrown application--one developed for use in their own business or profession--into a commercial product. Lack of knowledge, experience, or skills often prevents the idea from ever taking shape, let alone achieving its potential. Entering a new field to start a business leaves many developers unprepared and not even fully aware that it's something they know so little about. They will also often have a job that conflicts with the time commitment required to market the program well enough for it to become...