These two graphs come from UNEP's page on E-Waste, and while perhaps offering a wannabe obscene transparency in info (notice how the beginnings of the map don't show the sources), they have proven useful in figuring out exactly where the issue may lie. In the graph breaking down computer components, it becomes clear that all of the problems come as a result of these non-ferrous metals.
So, a possible avenue toward the fetish object at the heart of this thing might be to see what potential issues are solved via the use of these substances.
It seems as though lead is typically used in soldering, in the construction of CRT tubes (where it acts as a protectant against low-frequency electric fields and as a glare reduction layer).
==to be continued==
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