A-Z of Web Typography by Webdesigntuts+

This ongoing session of articles on web typography is a good read if you're trying to wrap your head around where to start with quality typography in your website. The content is well-balanced and useful to beginners as well as those who consider themselves to be a professional.  

...most information found on the web is written, so it’s only logical that we as web designers understand how to visually control it.
 
This session will help you do just that. Over the course of 26 posts, we’ll cover the A-Z of typography as it applies to the web.