If you are using ImageField and ImageCache, you might have had hard times trying to get Scale And Crop to show what you actually want of your images.
That is what ImageField Focus was made for.
It allows you to tell ImageCache what portion of the image you want to focus to, and what portion you want to be cut out.
Key features

Extends ImageField's Image widget (no separate widget!)
Adds a new Focus Scale And Crop ImageCache action.
Adds a new Focus Crop ImageCache action.
Uses a new jQuery plugin that will soon be also available as a separate download.
Integrates with Smart Crop.