Are you talking about the ones here at PentaxForums.com? I would suppose most of them are Mo's shots, but some of them are mine and I'm sure other members submitted theirs.
If you're interested in gear shots, I have a whole gallery of them:
Equipment
Most of them were taken with the DFA 100/2.8 Macro and the lighting is pretty simple: tons of it. Daylight, flash, incandescent...basically as much as I can get to bring out shadows. Stuff like:
(No flash, just ambient sunshine and incandescent lights to fill. Background is a white board.)
I recently did some darker ones, using my 24mm lens to accentuate the proportions of the lens on the camera:
(Click for bigger size. This was just two incandescent lights and a 5 second exposure at f/10. The background is a piece of warm grey matting board.)