Sprite Cow
Sprite Cow helps you get the background-position of sprites
...The tool generates copyable CSS containing background-position, width, and height values. It was created for developers who prefer manually optimized sprite sheets but want to avoid repetitive coordinate calculations. Additional options include percentage-based positioning and 50 percent sprite scaling for high-density displays. It also supports image reloading, configurable CSS paths, drag-and-drop filename detection, and offline use through application caching.