Aiming mirror?

Laser lense.

Solar eclipse lense

It's an IC of some kind, like an EPROM with a UV window or a small CPU sans heatsink.

Oh! Is it a CMOS sensor for a digital camera?

Kitsune is basically correct in that is an IC, but Bruce is actually closest.
It's from another type of projector, a DLP as opposed to the LCD I took apart last time.
That is a Digital Micromirror Device.
From Wikipedia...
"In DLP projectors, the image is created by microscopically small mirrors laid out in a matrix on a semiconductor chip, known as a Digital Micromirror Device (DMD). Each mirror represents one or more pixels in the projected image."
That little sucker has close to a million ittybitty mirrors that are physically moved electrostatically in an on/off fashion to represent each pixel of an image.
The scale on the ruler is inches.

http://en.wikipedia.org/wiki/Digital_Micromirror_Device

I just read that Wiki entry for DMDs. Bullshit... what they described is not possible. I mean, 16 micrometres across?... 1024 shades of gray?... SRAMs? C'mon, they just won't admit it's really magic, will they... not fooling me though, I know they've got pointy hats and dead black cats in the back room. :eyebrow:

Bruce, Bruce, Bruce...the black cats aren't much use if they're dead.

Well they weren't dead, until you had to go and open the door.

Huck Finn had a litany of uses for them.

:haha:

Heres a WTF is it for you guys , 4 views
http://farm3.static.flickr.com/2635/...e3a10a1f0f.jpg
http://farm3.static.flickr.com/2793/...0c319b57b8.jpg
http://farm5.static.flickr.com/4039/...53227e9c49.jpg
http://farm3.static.flickr.com/2498/...c11539cff1.jpg

simple hitch

metal turd...:unsure:

paperclip

After constipation-from-hell and Thor's paperclip, I think it looks like a device used to hold railway lines onto the sleepers ("crossties" as you quaint bumpkins call them ;) ).