The black one runs android 1.5 and has 128mb of RAM. The white one runs android 2.0 and has 256mb of RAM. The black one is harder to hack, runs slower because of the RAM, and will never run a lot of the newer apps because it will never run android 2.0.
If all you wanted was an ebook reader, the black one is fine. If you plan to use it as an android tablet, get the white one.
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