A Guide to Web Typography. The Basics
http://ilovetypography.com/2008/02/28/a-guide-to-web-typography/

I Love Typography
2008

Abstract:

Typography for the Web has come a long way since Tim Berners-Lee flipped the switch in 1991. Back in the days of IE 1.0, good web typography was something of an oxymoron. Today things are different. Not only do we have browsers that support images (gasp!), but we have the opportunity to make our web pages come to life through great typography.