Picnik

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No registration required (unless you want to save your image for future editing). Nice, intuitive interface that allows the user to upload images or use a host service (Flickr, Picasa, etc.). A full slate of editing features, including great effects. Levels & curves are available only in the premium version and full screen mode available. Easy to use!

Photoshop Express

This online version of the oh-so-popular image editor has familiar tools such as basic editing, effects, and fine tuning. What you won't find are the draw tools, layers, and more advanced tools. This does include 2 GB of free storage for images, personal galleries, and the ability to upload from Flickr and other hosting sites.

FotoFlexer

Add, and modify special effects with your own photos. Use animation, smart scissors, and many more fun tools.

Splashup

Splashup is a powerful editing tool and photo manager. With the features professionals use and novices want, it's easy to use, works in real-time and allows you to edit many images at once. Splashup runs in all browsers, integrates seamlessly with top photo-sharing sites, and even has its own file format so you can save your work in progress.

Add:

  • SumoPaint
  • LunaPic
  • Phixr
  • PicJuice
  • Pixenate
  • pixer
  • Sinpshot
  • thumba
  • picture2life
  • pictreat