I think GIMP is great; I use it all the time, even on Windows. If you're dependant on a lot of Photoshop plug-ins it may not meet all your needs. For vector/path based graphics (a la Illustrator), consider Inkscape. For diagramming there's Xdia and also yEd.
__________________
"Neither can his Mind be thought to be in Tune,whose words do jarre; nor his reason In frame, whose sentence is preposterous..."
|