uSpinMeRightRound for short… is a package that adds the functionality to rotate the orientation of an image once it has been uploaded into the Umbraco Media Section.
You can see a video here that shows it in action:
Essentially you get a 'rotate' option on the action menu for an image in the backoffice
and you can choose 90 180 or 270 degrees of rotation.
There is an optional option to create a new media item based on the rotation.
There is a blog post here with more info: