I just recently got the Sony charger for $15, both for the convenience and to do some reverse engineering. I'm not completely certain yet, (waiting for some parts from Sparkfun...) but it seems like the Sony charger has the two data lines shorted together. At least two other chargers that don't charge my PRS-T1 have the data lines open circuit. Apple has a different scheme...
I'll post more definitive results when I get my little USB breakout boards.
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