WhatFont – Easiest Way To Find Out the Fonts Used in a Webpage
http://chengyinliu.com/whatfont.html

With WhatFont you can easily get the font information about the text you are hovering on. To embrace the new web font era, WhatFont also detects services used for serving the font. Considered by many to be the easiest way to find out the fonts used in a webpage. This has been added to World Wide Web Reference Subject Tracer™ Information Blog.