Patricia Stewart's "Triton" (flash fiction, first contact, free): How earthmen learnt of the impending doomsday...
This fast moving piece is about human first contact with small crab-like intelligent alien elder race from Triton, one of the moons of Neptune. They've been attempting to warn us about a major comet-impact disaster almost already upon earth.
Fact sheet.First published: 365tomorrows, 4 January 2009.
Download full text from publisher's site.