Jim Rutherford at digitalmediaminute.com brought us this great resource in 2006…a compact, color–coded, visual table of all 252 valid (X)HTML entities. It is very nicely formatted, compact, and has a nice hover effect that displays the textual description of each entity. It even has a cool filter function, via the DOM, that is very fast. Do you want to see only the “quote” entities? Just type “quot” into the “Filter” field and…Voila! Very useful! This is still in my bookmarks list!