Typetester

The Typetester is an online application for comparison of the fonts for
the screen. Its’ primary role is to make web designer’s life easier. As the
new fonts are bundled into operating systems, the list of the common
fonts will be updated.

Technical details

Typetester’s code structure is XHTML, styled with the finest CSS and
driven by the JavaScript for manipulating DOM structures. Typetester
will not work without JavaScript enabled.

http://typetester.maratz.com/