Excellent free image and photo editor
You may also like
PaintStar is a versatile digital image processing software suitable for such tasks as retouching of photographs, composing and authoring images, image morphing, screen capture, and displaying image thumbnail in Windows Explorer context menu.
It supports alpha, layer, path ,and the most common editing techniques. PaintStar has many of the tools and filters you would expect to find in commercial offerings, and some interesting extras as well.