It seems that Xbox Live may be running short on unique gamertags.
As a loyal Xbox Live subscriber since the open public beta I thought my GamerTag was pretty safe. I was surprised, then, to receive an e-mail from Microsoft this morning telling me that my GamerTag was very similar to someone else"s and would I mind changing it. Apparently I have ten days to change it and I can claim a free copy of Project Gotham Racing 2 for doing so. It seems that this e-mail has gone out to any subscribers with similar GamerTags to other subscribers.
It would seem that recent upgrades or planned upgrades to the system mean that there is the potential for the online leaderboards to become corrupted and start moving scores around between gamers with similar tags.