Strange Horizons is an online, weekly speculative fiction magazine.
All of which is unnecessary prelude to the fact that you must read LET US NOW PRAISE AWESOME DINOSAURS! It is the story of Martian dinosaurs come to earth to do stunt car racing. No, really.
It starts off with a dinosaur trying to buy a handgun....
And, like many good things on this blog, I came across this via boingboing.