A cheat sheet for beginners to chess, to help understand algebraic notation.
A cheat sheet for poker, including how to play the three most common variants, hand ranks, and basic positional play.
A cheat sheet for the awesome board game Settlers of Catan, including lots of potential alternative (house) rules.
World of Warcraft may not be a web design, development or marketing topic, but that doesn't mean I don't need a cheat sheet for it. I've just started playing and can't remember all the slash commands and shortcut keys, so this is a simple quick reference for just that.