From io9, "8 Unstoppable Rules for Writing Killer Short Stories." These are rules for SF, though the article suggests that SF writers pretend they're writing for the New Yorker. It's interesting to compare these rules to the ones we learn in Creative Writing (literary) workshops. Should world-building be "quick and merciless"? Should characters be "a little fucked up," but mostly positive? Is the character-based / plot-based dichotomy a hoax?
As for io9 itself, I quite like it. They post constantly and I don't always have the patience to read the actual articles, but they have awesome pictures and the tags (Triviagasm, Steal This Pitch, Retro Futurism, Tanks...) are entertaining in and of themselves.