The Flickr WordPress Plugin allows you to add flickr images to your wordpress posts incl. a simple crop function.
Use 100 million free images from flickr
Full text flickr search box
The Local Image Cache provides an immediate performance benefit
Nofollow link to the author’s flickr site included
Nice full featured, Ajax powered interface
Support for WordPress Image-Caption code
High usability by use of easy interaction components
Select image size from 100 to 640 pixel on the longest side.
You can crop a photo if you need only a rectangular part of the image
Multilanguage I18n: English and German Language Support