To play devils advocate for a minute, isn't this thing going to burn in? I know it's designed for computer presentations, but those usually aren't very static (Even a slideshow only shows the same image for a few minutes). Showing the same images or patterns, as an arcade does, is likely to burn in any projection device, no? Then again, you got it for free and it's intended to be an arcade so I guess it doesn't really matter if it burns in, right? (For those who don't know, burn in is when the same image is projected for so long, or over and over enough that it's "shadow" becomes permanantly imprinted on the screen. It doesn't destroy the tv, but when looking at very light colors, or sometimes when the tv is in the off position, the "shadow" is visible.
I don't mean to ruin your fun, but I know that my projection tv has a ghost of the techtv logo in the lower right. You stand a better chance because the tv is intended for computer use, but like let's say you play pacman for like an hour, the level borders are projected at the same intensity in the same spot for that duration. It's likely to leave its mark. To better your chances, ALWAYS turn off the tv when you're not playing. Menus, pause screens, mame logos all spell trouble.
Still, a very cool project none the less

- Cobelli