To straighten your scanned images and crooked documents in iPhoto 08:
Step One
Open iPhoto 08 and select the image you would like straighten.
Step Two
Click the Edit button at the bottom of the window.
Step Three
The image will now be opened in Edit mode. Click the Straighten button at the button of the window.
Step Four
A slider will appear over the bottom of the image and a grid will overlay the image. Move the slider to the left or right until the image is straightened.
Step Five
Click Done at the bottom right of the window to save your changes!
