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Pligg is an opensource digg. May be of interest at some point.
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Get the good RPMs for REL4 here.
Get your ESBN
The ESBN (Electronic Standard Book Number) is the unique identifier of electronic media. ESBNs are recognized worldwide and available 24×7 online.
ESBN – Electronic Standard Book Number
Seems like you get a unique id number for each downloaded file and use some set of tools to track that number in the file as it moves about the countryside. via eHub.