Meet the GIMP!

"This is a video podcast about GIMP. Gimp is a very powerful image manipulation program. It is free (as in speech and in beer), it is open source and it runs on Linux (and other Unixes), Windows and MacOS. It can do nearly all the stuff you can do with Adobe® Photoshop® and more than a lot of other programs including Adobe® Photoshop® Elements®."

http://meetthegimp.org/