CSS Data URI's are a way to encode images directly into CSS. This helps to reduce the number of HTTP requests on your server. For example: Instead of linking to an external resource like a background image, your CSS can have the image available within it. As soon as the CSS is loaded the browser is ready to render the image. This can have real speed advantages, especially if the browser is configured to limit the number of connections to a host. By freeing up a connection you can improve your rendering time. Another advantage is that if you are serving across a secure connection then all of your page elements can originate from the same, secure site, and not generate those annoying warnings to your visitors that some elements are not secure. More information on CSS data URI is available at http://en.wikipedia.org/wiki/Data_URI_scheme Spritebaker ( http://http://www.spritebaker.com/ ) offers a free web-service. They will take your CSS and parse...