These are very handy for having up on the wall near my desk at work, just for a quick look for tags or events when I’m building a site.
If you don’t know HTML5 or are learning, these could be very handy. You can download the images or even have them professionally printed.
HTML5 Cheat Sheet — Tags
HTML5 Cheat Sheet — Event Handler Attributes
HTML5 Cheat Sheet — Browser Support
HTML5 Cheat Sheets By InMotion Hosting — A Dedicated Server Provider.