Picnik is an impressive web based photo editing tool. It has many of the features of stand alone photo editors but allows you to access and manipulate images on the web. For example you can integrate it with your Flickr photos, great for editing those under exposed camera phone shots. The Flickr integration gives you the opportunity to replace the original photo with your edit, or add it as a new image. You can also grab images from stand alone sites such as a Gallery install. For example at Lewis Elementary we are starting to use Gallery to post images that student can share and use in their projects. This could be a great way for them to get to them and adjust and manipulate them. I was very impressed with how fast and responsive it feels with resizing and adjusting exposure.