This is a really nice glanceable reference for CSS grid.
A nice little cheat sheet for simple simple typography wins.
A handy cheat sheet of jQuery methods to print out and keep on hand.
A cheat sheet for combining typefaces. No hard and fast rules but a handy guide to print out and use.
Just in case you haven't seen Brian's microformats cheat sheet, here it is. Print and keep by your desk.
A very handy list of common functions and parameters. Print it out and keep it on your desk.