The jDome is the brainchild of John Nilsson and allows a player 180Â° field of vision. "All you do is put the jDome in front of a projector, mirror the image in the projector, change the Field of View and you're good to go." Simple as that. Nilsson estimates the domes will go for $125-$200 as soon as he procures the necessary fundage to get them made. If you're really interested you can provide a donation at his website or make one yourself out of your little brother's bedsheet and sister's hula-hoops.
UPDATE: No, your audio isn't screwed up, John just has trouble pronouncing the name of his product (0:59).
Thanks to Pork Musket, who games the old fashioned way -- with a real gun.