Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
picinfinity - Picinfinity is an image retaining/proxy site.
Flickr - image and video hosting website
PicPicGO - Bring all of your favorite photos with mass amounts of storage space.
PostImage.org - Provides free image upload and hosting integration for forums.
Libris - Libris is an asset management for photos and videos.