I notice that CN tends to use different fonts at times. It's my hope that in the future they'll always use a sans-serif font. For example, this current article is written in some sort of serif font (Times, Palatino, etc.), which is harder to read on screen than a sans-serif font (Arial, Verdana, Helvetica). And every indication is that it's a web issue, not a browser issue, as I checked it in different browsers.