2.35 followup
Do any of the modern front projectors have preconfigured settings that change the projected screen size easily. If so, could you have a 2.35 screen, set your projector to cover more than the screen, and let the black bars on top slop onto black cloth or something above the screen (or would that be noticable). Then if the movie was 16:9 have some curtains on the side that cover part of the screen and use a smaller projected screen size. I guess that would presumably make your 16:9 movies brighter, but presumably you could calibrate that as well. If all of that was easily able to be set on the remote it seems like it would not be too bad.
A previous post mentioned 2.35 anamorphic, let's say that a new 1080p blue ray disk is of a movie that was shot 2.35, and they released it in it's native aspect ratio. Are there 1080 useful lines of info encoded on the disk or is it something more like 750 lines that are useful and 330 lines of black? Seems like it must be the latter or you would not get pixel representations that were of uniform height, so if you tried to show it without scaling on a plasma for example you would be out of luck.
Hopefully this rambling makes some kind of sense (pretty new to all this). I am planning to get a front projector sometime in the next 6 months and I don't remember seeing the above covered in a review that I have read... Do 95% of people just get 16:9 screens and have a slightly smaller screen when watching other aspect ratio movies?