Last year, Starfleet International opened a new website dedicated to Star Trek Fanfic. Recently the website has opened for submissions to the 2011 STARFLEET Short Story Contest. Those wishing to submit must be members of Starfleet International. The top entries (I believe the top 4 or 5) are published in the Starfleet Communique - official publication of SFI read by members around the world.
I believe submissions are accepted until June, but check the web site for details.
Live Long and Prosper and