Hoefler & Frere-Jones typefaces. Their typography foundry is held to be second-to-none among typeface quality and frequency of usage in print and elsewhere. I

Hoefler & Frere-Jones typefaces. Their typography foundry is held to be second-to-none among typeface quality and frequency of usage in print and elsewhere. In particular, their typeface Gotham is incredibly popular, and making it available as a webfont publicly is a big deal. Also, this effort has been underway for at least three years. Their attention to detail ensures that these webfonts are going to be some of the best available anywhere.