Here's an interesting shot for you. I'm still setting up my theater but took this shot to send to a friend. This should be a good shot for people worried if the BenQ will be bright enough.
The 'screen' (110" diag.) is my wall, painted dark blue (Behr Mood Indigo). Why is it interesting? Well, for one, even though I'm projecting on a dark, non-white surface, it still looks quite good. Two, there's quite a bit of ambient (non-direct) light coming in the room as you can see on my laptop and DVD changers.
Note, I haven't calibrated the projector yet, other than adjusting brightness/contrast and color a bit to adjust for the blue.
http://slepicka.net/IMG_0394.jpg