New estimates, based on a tear down of a unit by Austin-based Portelligent, put the cost of components at a mere $220. This does not include the cost of final assembly.
The most expensive part is the touch screen, (probably) produced by a German company called Balda. The estimated cost of the screen is around $60. Samsung produced the main microprocessor chip and the NAND-type flash memory.
The production cost of the much less popular 4 GB version of the iPhone is $200.