From BoingBoing by way of SF Signal, the laws of science fiction. This isn't just a list. There is thoughtful corollaries and commentary about why the law should be obeyed by writers (and why a reader might shrug and put the book down if the laws are abused). For example:

Law No. 4 Given Something an Alien Name Doesn't Make it Alien.

Raktajino is coffee. By giving it a Klingon name it sort of appears alien, but everyone drinks it like coffee. It looks like coffee. It is coffee. Don't think that by making cows into Dvigids and Horses into Pytkos that you are not writing a western....