Splashup, earlier known as Fauxto, is a web based photo editor that looks just like a desktop application. Users coming from Photoshop should feel right at home with this editor.
You can open files from your computer or from all popular photo sharing sites. You can open multiple images in a tabbed environment. It supports the concept of layers, like Gimp and Photoshop. Splashup also has the ability to import images from your webcam.