We here at Irreal are big fans of Aaron Hawley's Giant Emacs Reference Card and have often written about some of the tidbits contained therein. Now Hawley has announced that he's revised the reference and added another 500 commands for a total of more than 2000. It now covers keyboard macros, Dired Mode, Occur Mode, table, and Calc.
For me, one of the nicest things about the old reference card was the pleasure to be had from reading random sections and learning something new. I'm looking forward to the same pleasure with the new version. If you haven't yet seen it, be sure to head on over and take a look. I have it bookmarked in the Documents section of my browser for easy reference.