I’ve been experimenting with CSS sprites as of late, I’m half way through this project now so there seems little point in introducing them at this point. Basically speaking a CSS Sprite is a bunch of images amalgamated into a single image that you then use CSS and the :hover etc functions associated to links to move different parts of that image into view (Tabs would be an ideal example of this).
e.g.:
Anyway I found this very cool site that explains a lot more about it and it provides a cool tool to help you merge your own CSS sprites.
http://css-tricks.com/css-sprites/
