Aaron Stanush talks about some of the web font hosting services and how to integrate them within a Drupal theme. He talks a little bit about some of different web font hosting services such as typekit, KERNEST, and Monotype's fonts.com web fonts. These fonts are implemented via CSS, are accessibility and ensure cross-browser compatibility. He talks a bit about the @font-your-face Drupal module to integrate the web font hosting services mentioned above in addition to Google Fonts, Font Squirrel and Fontdeck.
For more information, be sure to check out his presentation "The type revolutionary's cookbook" at DrupalCon Chicago.