I'm looking for a way to determine user identity so I can globally
track game scores off phone.

IMEI provides identity of the phone - not effective if phone is on-
traded or upgraded by individual.
USIM provides identity of phone carrier subscriber - assumes device is
phone, and currently has a SIM card

I'd like to be able to provide continuity as a user upgrades to a new
device.
And I dislike being forced to create an account on each global scoring
system, so I don't want to force that on my users. And my end user
experience with OpenFeint leaves me disinclined to use it.

It doesn't need to be bullet proof. But it does need to be hassle free
for my users.

Is there any other identifier on an Android device that I can use to
link data more cleanly with the current owner?
And how would I get hold of that identifier?
I'm thinking something like the user's Google account .. or similar

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