Well I''ve been thinking, seems like there would be some pretty cool things you could do with 3d textures. They are huge and don''t seem practical, but I would like to see what could be done with them. I googled it for 1/2 an hour and found basic explanations and concepts. Nothing on any effects that were tried to create, or hell on loading a 3d texture. Is there a 3d texture file format? Or do you load 2d textures on top of another? Any one have a site has good information? Or has any one messed around with them and wana share their thoughts?

there are quite some uses for them. Check out some nVidia and ATi dev-pages to find some. How to load them is described in extension specifications on opengl.org.
Personaly I used them for distance attenuation for perpixel lighting and some animation effects.

You should never let your fears become the boundaries of your dreams.