Do you have any pics of how this was all setup? Maybe of the build process? More specs on the PC as well? Thanks.. it's a beautiful setup. I'd like to show the wife this and sometime in the near future have something like what you've setup. The accessories complete the setup, almost like an old movie house.. I'd add one of those classic popcorn machines too.
In all honesty, the build process was fairly simplistic. The ceilings are Drop Ceilings (It is a basement in case that wasn't obvious) and so wire running was fairly easy. I planned out what I wanted in terms of technology, and then planned out in terms of that. I decided I wanted to max out the inputs for my projector so I ran a 25ft DVI cable, component cable, composite cable, and s-video cable, just in case. 25 ft worked well and I ran it across the ceiling and down the wall to the stand under the TV. The Speakers were wired the same way, and then run through the ceiling and down the wall. The screen is held up with several very strong lag bolts. I got a $20 mount from eBay made for my projector and simply mounted it in place. I got my mom to decorate it and pick out all the accessories etc, because that really isn't my thing, I'm more of a technology and get-your-hands-dirty-guy

. The mural on the wall is actually like 12 strips of wallpaper that my mom put up. I don't know how she does it, because I can't see the seams and everyone that sees it seems to think that it was painted.
The PC has some very modest specs, and because it is a PC, I don't use it that often, but it's nice if i have something on my main machine and want to stream it down there, it has the following specs:
1.7Ghz Athlon XP Mobile
Large Copper Heatsink so it says cool and quiet
Dual Layer DVD Burner
512MB RAM
Radeon 9600
80GB Hard drive
Windows XP Media Center Edition 2005
And xp media runs just fine on it, you really don't need a lot of grunt. Then again, I'm not using the box as a DVR, and I'd recommend something a bit faster (2.2Ghz+) if you wanted to handle more then just one Low-def recording.
I hope this answers a few questions, but if there is anything I left out feel free to ask, I'd love to help out with your future theater.