What is the secret to Web design? A tough question and one that might not have an answer. In 2006, Oliver Reichenstein wrote Web Design is 95% Typography.
Paul Scrivens has written a good article on typography and it's importance in design. Several good examples are cited and resources that can be found on the web for further exploration. If you are at all doubtful about the importance that type plays in a design use his simple tool as a way to discover for yourself: "Try going through all the Web designs that you love, strip out the images and ask yourself “how would that website look with just text and spacing?”
Via Georgia Gibbs Design