Marko Dugonjić's typetester gives you instant previews of how a text of your choice would look on screen set in a certain font and size. It offers full control of the font styling, including the background colour, with the choice of displaying either fonts from your own system or standard system fonts for Windows, Mac or both.
The interface offers instant comparisons of up to 3 different styling options side by side, and once you've got what you want, it even lets you generate a ready-to-use CSS style based on your selected settings, saving you from having to recreate the style before you can use it. 

Simply excellent.

» typetester.maratz.com