From Six Revisions:
Web-based image editors have several advantages to its desktop counterparts. The most obvious benefit is that they allow you to work on any computer (that has a browser). In most cases, you can save your work online, avoid having to install desktop software, and interface with other web based services such as Flickr or Picasa. This article shares 6 of the finest, free online image editors that are capable alternatives to desktop applications like Adobe Photoshop and GIMP.
See the List
Mediawiki (Wikipedia and Beyond)
Beginning Joomla! (Beginning from Novice to Professional)
Joomla! For Dummies (For Dummies (Computer/Tech))