Web 2.0 is in continue evolution, now there is the chance to edit pictures online. It is possible to resize, adjust, crop or enhance pictures free and without any software.
It is possible to import and save pictures from any URL or from Flickr and it is possible to save in GIF, JPG, PDF, PNG or TIFF.
It is possible to do at SNIPSHOT.com
another source is: picnik.com