The W3C validator—one of the most valuable tools in the web developer toolkit—is in danger. Please help out. And please spread the word.
Link archive: December 11th, 2008
This article is an oldie but a goodie. I find myself referring to it all the time: "Beating typographic correctness out of (X)HTML: more than you ever wanted to know about dashes, spaces, curly quotes, and other vagaries of online typography."