Other
Poets & Writers Magazine: Classifieds
Found in these classifieds are numerous calls for manuscripts of various kinds (some of a somewhat controversial nature). Contests are also mentioned.
Other
The Writing Conference, Inc.: Writing Contest
This site explains the basics for the writing contest, which is open to all students. There are contests in poetry, narration, and exposition. The topic is the same for all three forms and links are provided for the judging criteria.
Other
Movie Bytes: Contest List
This resource lists several contests for script writing. Most of the contests involve an entry fee and are open to anyone.