Flickr is the best photo sharing site available and Picnik is one of the best online photo editing tools. Both have some together today to make it simple to edit your Flickr photos with out leaving Flickr.
Click on any of your photos you will now see a “Edit Photo” button on top of the pic along with other buttons. All you have to do is click that button, photo editing will open for you in the same Flickr pages. You can Auto-fix, rotate, crop, resize etc in just few clicks.