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How dificult would a universal DC power supply system be? I'd sure like to have some sort of universal "DC Power Cent(er)/(re)" that had perhaps 12v and 5v rails that had a standard socket/cord sytem that multiple DC lovin' appliances could plug into? Are there serious disadvantages in forcing electronics to pick betwen 5 and 12 volts?

Exactly. Power supplies for my phones, PDAs, cameras, radios and other miniaturised gadgets are often bulkier and almost always heavier than the devices they feed, and, needless to say, mutually incompatible. Solving this problem should be simply a matter of standardization.
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Dragi "Bonzi" Raos Q#5196 MkII #080000376, 18GB green MkIIa #040103247, 60GB blue