Here are some examples of Google font API which you can find from Google Font Directory. These fonts are available for use on your blog under an open source license and are served by Google servers.
These fonts are some of more beautiful Google Font API i like very much. How about you?
Lobster
Cuprum
IM Fell DW Pica
Josefin Sans Std Light
Neucha
Philosopher
Reenie Beanie
Tangerine
Yanone Kaffeesatz
See: How to use these Free Fonts from Google on your Blog?