This module (drupal.org/project/fontyourface), a relatively new discovery for me, gives you an administrative interface for browsing web fonts from a variety of sources, including TypeKit, FontSquirrel, and more, and implementing them in your site’s theme using the @font-face property. This promises to make working with web fonts significantly easier; while with certain font services, you can download the font files, import their stylesheets into your theme’s CSS and work with them that way, the @font-your-face module looks especially good for implementing hosted webfonts, such as TypeKit and Fontdeck, that don’t necessarily have downloadable fonts that you can load into your theme.