Google Fonts is an absolutely awesome collection of web fonts that you may use in your HTML web pages without any restrictions.
These fonts not only look more beautiful than the common typefaces like Arial and Verdana but they are more readable as well since the fonts have been designed specifically for the web. Also, all Google web fonts are offered under the Open Font License meaning you may use them even in commercial projects without having to worry about licensing issues.
You can start changing the font to anything you like with the following font embeding codes declared as the first HEAD element in page.tpl.php. You should first create your own font stack via Google Font Directroy
To know how to implement Google Font, please visit http://www.drupalook.com/