This is a free service that allows you to experiment with different types of Google Fonts in real-time. Simply enter the URL of the site you want to preview, click “Go!” and you are set.
You can change the font easily and as many times as you like. Once you are happy with the result, click the “Get Code” button, choose the style and character sets, and follow instructions.
You might also want to request feedback from your audience or friends before implementing the font on your site. TypeWonder lets you share the link to the preview page on Twitter or by email.