Aaron Hawley has updated his already huge Emacs cheat sheet from 1000 commands to 1500. You can get it from the EmacsWiki. At 60 HTML pages (15 when printed) it’s far too large for everyday use, but it is fun to read through. One could, I suppose, bookmark it and then use the browser’s search function to find the command you’re looking for but it’s hard to see how this would be any better than Emacs’ already excellent built-in documentation. Using 【Ctrl+h a】 to search for your desired command with the apropos command or even 【Meta+x】 info-apropos to search the info pages would keep you in Emacs, be faster, and probably be just as useful.
Still, I really like this reference. One of its better uses might be as a sort of manual Emacs COTWD. Reading one or two commands a day could be an enlightening experience.