The free Pixlr is like a superclean online version of Photoshop; and considering that it operates within a browser window, the software is amazingly robust. Pixlr's various tools have a distinctly artistic bent. For instance, the pencil tool simulates using the tip or edge of a pencil, depending on how you move the cursor. The software also comes with excellent filters galore. Your first impression is likely to be, "Is this really free?"
--Jon L. Jacobi