Apple 2.0 offers a breakdown of a research project by MacObserver forum members.

Member “Tommo_UK” kicked off the project by asking purchasers of an iPhone 3G to post the IMEI number, date of purchase and part of the serial number.

The IMEI (International Mobile Equipment Identity) is a unique 15 digit number that is assigned to each individual mobile phone sold, the forum member’s plan was to collect enough IMEI numbers to decipher how many units Apple was selling.

His numbers are presented in a public spreadsheet show that Apple has reached 9.2 million manufactured iPhone 3Gs, added to the 2.4 million first generation iPhones sold earlier this year it takes Apple pass its self-assigned target of selling 10 million iPhones in calendar 2008.

It should be noted that all figures are manufacturing estimates and many of the iPhones could still be in retail channels and will not count as sales.