MashStories holds four competitions a year and the only requirements for entry are that your story is 500 words or less and it uses three keywords (provided during each competition). The keywords for my competition were: Congress, Art and Jealousy.
You can read my story here: Smolder
And now you can hear the rad podcast version here:
[UPDATE : Apparently the podcast file has been removed from SoundCloud but I’m keeping up this link until I can find a copy.]