Between October 2003 and January 2005, the Xbox Linux Project asked all visitors to their website to enter their Xbox serial numbers, date and country of manufacture, ROM version, hard disk and DVD drive brand and other properties, and gathered more than 14,000 entries. The original idea was to find a rule to deduce the hard disk and DVD drive types in an Xbox by only looking at the serial number, which was visible through the unopened packaging.
This guy has spent a lot of time putting numbers together. And, frankly speaking, while I don't see much value in the findings (as one of the commenters pointed out: just go a talk to the Microsoft!), it's always exciting how numbers that are put in order can tell a story.