picinfinity - Picinfinity is an image retaining/proxy site.
ImageVenue - ImageVenue is a great online hosting service that allows uploading pictures for showing creative works with a simple-to-use technique.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
UploadHouse - Thumbnail and resize your photos and images
Libris - Libris is an asset management for photos and videos.
ImageBam - Free Image Hosting and photo sharing.