H&FJ: Four Techniques for Combining Fonts

H&FJ: Four Techniques for Combining Fonts:

Hoefler & Frere-Jones:

Here are four tips for navigating the typographic ocean, all built around H&FJ's Highly Scientific First Principle of Combining Fonts: keep one thing consistent, and let one thing vary.

Positively bookmarkworthy. This is great stuff, and the examples are top-notch.