"It's super easy: just select the file, click upload and you'll see a cropping window on the next page. Drag the window with your mouse to select the part of the photo you'd like to be your picture. You can also change the size and the shape of the window by dragging the corners to include or exclude as much of the backdrop as you'd like. When you're done, click the 'crop photo' button, and, voila, you will have a new profile photo. Or, if you think the original photo is good enough, click 'use original' and the whole, uncropped image will become your profile photo. If you would like to experiment further with photo options, just click 'cancel' and upload another photo."
For more Details Orkut Blog