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Skitch lets you add notes, arrows, and shapes to maps, images, and more for an easy way to show your ideas visually.
Skitch lets you crop images so you can zero in on the area of the image to make your comments.
You can take a new photo, grab one from your library, draw on a map, draw on a blank page, or capture a screenshot from the Web.
The tool palette is a spring-loaded drawer on the right, letting you add arrows, text, shapes, and more.