Launched in May, Google Web Fonts allows you to simply choose the font(s) you'd like to use on your webpage, blog, or web app, and embed the snippet of HTML and CSS. In about 30 seconds, you can have beautiful fonts on your pages that'll render correctly in the large majority of popular modern web browsers.
Until, now, when you created a website or web app, you were largely limited to a few select "web safe" fonts such as Times and Arial. If you deviated from these fonts, you were required to use Adobe Flash or your embed text in images to embed the font of your choice. No longer, with Google Web Fonts it's now possible to use hundreds of web safe fonts on your web pages.
"Unlike Times and Arial, which're references to fonts installed on a user's local machine, web fonts are served via a browser request (much like an image would be served). That means you can push any web font to a user's machine. Users will be delighted when they realize these fonts behave just as any other text in Arial would behave," explain Google.
The adoption of the web font technology has been rapid. Google Web Fonts now serves roughly 50 million daily requests, across roughly 800,000 unique websites, and is growing at about 30% each month.
More Info: Google Web Fonts