Periodic Table of the (HTML) Elements
Josh Duck created a nice Periodic Table of the Elements showing all 107 HTML elements in the HTML5 Working Draft. Each element has a link to both Mozilla’s documentation and the W3C Candidate Recommendation. I have trouble remembering some of the less common elements. This table is a nice reference and reminder. I like it so much I made a quick and dirty desktop wallpaper of it, so I can have it handy.