i have gone through some tutorials...

i have gone through some tutorials on opengl and am interested (very). So far I have a spinning textured cube that i can make it move front and back along the z axis and make it spin faster. I can change the textureing to things like mip mapping and so forth i can change lighting and tranceparency. What should i learn next and does anyone know where i can find tutorials?

this website has a page with links to tutorials…
http://www.opengl.org/developers/code/tutorials.html