I usually try to include photos of the gadget's different sides to show the various ports and buttons. And, to provide a general description of the device.
As for the arrows/circles/other indicators, we've talked about this for a while. There are arguments for and against. On one hand, they are great for showing where the screws that we're talking about are. On the other, they can obscure part of the photos. I'll try it on the next gallery and see what people think.
As for the PDFs, we're working on that.
Keep Up with TechRepublic