Thanks! In case anyone else looks, here are a couple of good online tutorials:
NeHe Productions has tutorials on OpenGL, a 3D graphics library.
Thinking In Tkinter is useful for anyone considering Tkinter, an interface system that works with several languages and is the basis for Python's IDE.
Pygame has tutorials and other projects for Pygame, a free game-development library for the (also free) language Python. Python/Pygame is a relatively easy language to learn, and still powerful and flexible.
The Game AI Page has info on Artificial Intelligence.
This person has info on the Model/View/Controller theory of program design, a way of organizing input and output.
Pixel (currently over its bandwidth limit) has a great series of tutorials on drawing 2D sprites and tiles.
Tile Studio offers a tutorial on its own program, which is meant for use with specific code but can export tiles you draw to BMPs.
POVRay offers a free raytracing program for producing impressive 2D "scenes," and has documentation.
Hero Machine is not a tutorial; it's a toy that runs in the browser and lets you design characters in paper-doll fashion, with some furry features available.