A Drag ‘n’ Drop CSS Sprites Generator – Stitches
Stitches is an open source HTML5-powered application for creating CSS sprites on the fly.
With the help of a couple HTML5 APIs, images can be drag 'n' dropped and the sprite image + CSS rules are instantly generated.
It uses Modernizr to check for drag-and-drop, FileReader, and canvas support (which are currently available only in Firefox and Chrome).
A must-bookmark tool for saving time on creating sprites specially when there are too many images to merge.