Selecting Fonts & Typefaces
We have all heard of the golden mean (also known as the golden ratio or golden section): the self-replicating page with a proportion of 1:1.618 that is said to be found in everything from the design of ancient Greek architecture to the growth patterns of plants. This and other meaningful ratios rooted in geometry, music, nature, and history can be expressed as modular scales and put to work on the web. Fig 1: A simple modular scale: 10@1:1.618 Fig 2: Our example page, designed using a modular scale.
Fontularity: Most Popular Fonts by Operating System [Infographic]
UPDATE: Check out The Big Book of Font Combinations on sale now! I recently compiled a list of the 19 most popular fonts according to usage by graphic designers from all over the web. I could have had 100, but I got it down to under 50, and from there whittled it down to just the 19 best fonts.