http://www.qualibyte.com/pixelformer
Pixelformer is a bitmap editor, specifically optimized for creating, modifying, and converting small and medium-sized images, such as icons, buttons, avatars, web graphics, game graphics, etc.
Pixelformer is faster, smaller, easier, more precise, and often more efficient than large bitmap editing tools; at the same time it is more powerful than any classic simple icon editor.
Pixelformer can be a complete solution for those who need to create, edit, resize, or convert icons or other small images. Even if you prefer to create graphics in some sophisticated high-end image editor, Pixelformer would be a useful tool for doing final tweaks, conversions, and optimizations.