Screenwriting : Online Film/Screenwriting Courses? by Cheri Dodd

Has anyone taken, and found beneficial, any online screenwriting and film-related courses or programs? I looked into the brick and mortar courses at University of Memphis, but it just isn't in the cards for me to return to school at this time. Maybe in the fall, but for now, is there any particular online screenwriting program that would be recommended for a dedicated, hardworking, self-motivated student?