Hopefully this doesn’t catch on as the newest procedure that must be completed before you are allowed to RMA a motherboard, because I don’t think my dentist would let me use hers.  MAKE:Blog has linked to an animated X-Ray of a PCB, allowing you to see right inside the world below the tracings on the surface.  It really gives you an idea how 3 dimensional the circuitry is.
“I love looking at PCBs (printed circuit boards) using x-rays. Great for failure analysis. One of the coolest things, I thought, was seeing a PCB tilt in real-time; you get a good sense of the actual spacial relationship between all the layers on a PCB. I took a series of stills today and strung them together into this animation so I could share the experience with you…”

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