Pixenate is an online photo editor. It has a bunch of features as you can see below. Simply upload your photo, edit it, and either save to disk or upload to Flickr. No need to register, just upload an run!
SynchroEdit is a browser-based simultaneous multiuser editor. It allows multiple users to edit a single web-based document at the same time, and it continuously synchronizes all changes so that users always have the same version.