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> I was also looking for another unique ID that users are identified by

They can use plugins / extensions installed. Fonts installed. If cookies are enabled or not, etc. Check out: https://panopticlick.eff.org/

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Most of the identifying information used by panopticlick requires using javascript/flash/java to obtain. As such, it isn't available when simply parsing HTTP headers and packets (as much of the data in XKeyScore appears to come from).

(That is, unless you visit panopticlick.eff.org, which then sends all of the processed information over the wire in the clear...)

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