This plugin which allows fast and easy add new Google Fonts to your website, modify your theme as you wish - create custom titles, comments etc.
Typecase is a web font management plugin that allows you to browse, search, and embed over 650 fonts from Google Web Fonts.
A simple plugin that lets you use and customize (in real-time!) any fonts from Google Fonts on your existing WordPress site.
A one stop plugin for all your fonts, FontMeister pulls fonts from Google Web Fonts, Typekit, Fontdeck and Font Squirrel for you to use in any theme.