The font stacks section of the template administrator controls the appearance of the fonts on your site. These styles are written to the body class of the template and a container div in the template. The Zen Grid Framework is able to load a selection of font stacks that are commonly available across the web and it also has the capacity to load fonts from the Google web font directory.
There are 18 different font families available in the repository and unlike other font replacement techniques the Google font solution is standard across browsers. For a full run down of the fonts available please plus some more information on using fonts with the Zen Grid Framework please visit the Zen Grid Knowledgebase.