T4LT - Image Editing

Pixlr.com is an online image editing program with an impressive array of tools and features. Fundamental image manipulation skills are essential for teachers and learners. And beyond the fundamentals exists a world of creative and productive possibilities for course assignments and assessments.

Other free imaging programs you might find useful:
http://www.picnik.com/
http://www.aviary.com/tools/image-editor
http://www.sumopaint.com/home/
http://www.splashup.com/
http://www.photoshop.com/tools?wf=editor