I don't have photos. But my a guy I met @ a private LAN with friends was the last one left at the LAN which was at my house and he said, "My PC is running very hot, can you open it up and see if everything is all right?". So I got a screw driver and popped the side off the PC and to my horror, the entire inside of the PC was caked in dust, you literally could not see the motherboard, CPU (you could make out the shape of the fan under the dust), gfx card, HDD etc. Once we got all the dust off with an air compressor the temperature dropped about 10-15 degrees celcius.
Some of the stuff Im seeing in this thread is amazing... Those poor machines.