Need to quickly and easily crop a photo or image? Just open it up in Preview. Choose the Select tool and select the area. Then choose Tools, Crop or use Command+K. Save the file, or save it using File, Save As to save it as a new image. Handy for quickly making icons for Facebook or Twitter.
Related: Convert PDFs to Images With Preview, Preview Magnifier, Adobe to Preview…, Quick Look in Open Dialogs, Safari Upload Browse Button.

You are the best! Invariably, i find just what I need.
Thank you!