All this talk of projectors has made me think of, um... projecting. And not in the psychological sense, although I do plenty of that. The slide projector has really been an incredible tool since it came on the scene, and someone who has used it well consistently is artist Lorie Novak.
I started to make projection work when I was in grad school, and people always thought it was derivative of Novak's work, which I had never even seen. Funny how that happens. Here are images from two sets of her work; these up top are from Out of Darkness: Projections on the Night Landscape, 1987-1991.
I believe most of these exposures were several hours long.

(night swimming!)
These below are from Novak's project: Interior Photographs, 1983-1998.



Uncle Sam, 1983

Here are two of mine. I had to dig through the vault to find these. Both are circa 2001, I believe. I sometimes projected images into my bedroom, and also just used the powerful light of the projector to make images in the dark. In the second one, which was a several minute exposure, I danced back and forth over the bed. I was wearing something glittery and gold, hence the trail. Also I seem to have liked flamingos.
You guys know what I'm going to say next: Send me images using projections!
I'm so predictable.

Check out Abelardo Morell's work. It could fall into the same category of projections, but his work is a bit more real.
http://www.abelardomorell.net/photography/cameraobsc_49/cameraobsc_52.html
Dana Damewood makes some amazing photos using slide projectors too.
http://www.danadamewood.com/projection_frames.html