Glad to help! I'll post about 3D software later this week, but I have two quick additions to make concerning 2D image creation:
VECTOR GRAPHICS
Adobe Illustrator (Windows, Mac)
I don't personally have experience with this program, but I can't imagine an Adobe program being all that terrible. The PS+Illustrator tool-set is popular among graphic artists.
http://www.adobe.com/products/illustrator/
PAINT PROGRAM
ArtRage (Windows, Mac and Linux + WINE)
Literally a paint program -- it simulates painting or drawing in various media (conte/pencil/oil/acrylic/etc etc). I've yet to get it working under WINE (I'm a Ubuntu user) but I've heard some very positive first-hand accounts. And it has a free version.
http://www.ambientdesign.com/
-Glee
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