Seems there ought to be some good ones in these threads:

100 Words or Fewer Writing Contest for short fiction that will make us shiver, any genre: whimsy, allegory, mystery, romance, fable, humor, love, fantasy, even horror. Awards: $500, $200, $100 plus publication on Web site. Also 20 honorable mentions. All entrants will receive free checkmark evaluations of their submitted stories. Entry fee: $15. Deadline: extended to December 30, 2008. Info: www.100wordsorfewerwritingcontest.com.