BurstFiction.com is a site I discovered on a Whitechapel thread a few days ago. It publishes 1000-characters sci-fi and fantasy stories. You should have a look at it, there's some great stuff up there. Check out a few of these posts:
KAYLA by Cobweb
NANOSENTRY by Chaz Siu
UNDER PRESSURE by TreeBeard
More fabulousness in their archives. Enjoy.