Comment on Pixel Image Editor

Krita is an image manipulation and painting application by the KDE project (thus free software). It’s a cool, but not prominent part of KOffice. It currently only runs on Mac OS X though X11, but Krita 2.0 is expected to be released in early 2008 as native Mac application.
More about Krika can be found at http://cyrilleberger.blogspot.com/