Google site today added a wide variety of Google Web Fonts, making it easier to style your website and make it look awesome.
Now you can go to Manage Site under More Actions and choose Color and Fonts in the left-hand navigation to choose fonts for the entire site in one go. The web fonts feature lets you select different sections of the site such as the entire page or just the title to selectively choose your styling.
Additionally, Google given you control over font sizes for many of these sections.
Take a look at a site that uses multiple web fonts:
[Source: Google Docs blog]