I know these surround gaming subforums tend to be focused on TH2G and SoftTH, but I'd like to bat around a few other surround gaming methods in this thread that are out there but mostly just concepts. Both of these are using projectors.
First one I'd like to mention is iDome. It's a concept by Paul Bourke that uses a half-dome convex first-surface security mirror to project onto a half-dome screen.
http://local.wasp.uwa.edu.au/~pbourke/miscellaneous/domemirror/
The second one is jDome. I'm not as impressed with jDome, but it's easier to achieve. It's just projection onto a half-dome rear projection screen. I could see that this might have focus issues with the projector.
http://www.jdome.com/
Racer_S was talking about making a utility in this thread: http://www.widescreengamingforum.com/node/10894
Wonder if he would be interested in doing a fisheye and convex mirror pre-warping app too? IMHO, there would be a lot of commonality in the codebase for the apps. The only thing that would keep something like iDome from existing is the pre-warping utility doesn't exist yet. We all could have the option to be doing half-dome projection soon if that utility was available to us.
I'm willing to pay a bounty to someone if they can make the pre-warp utility for the community.