Domes, Planetariums, Fisheye, Spherical Mirror

Paul Bourke's website is a fantastic resource for understanding all types of image projections and related conversions. There's a lot of good information there, written very accessibly.

I wrote a tool a few years back for stitching fisheye images together, and his website was by far the best introduction for wrapping my head around the problem.

The U.S. Army has a dome simulator for learning how to use the Stinger missile, I’d really like a low cost version of that for a hippie Disneyland.