This week's prediction is about (what else) the iPhone. We're asking: How many total units of the iPhone will Apple sell in 2008?.

For background, Apple sold 2.3 million units in Q1 2008 and 1.7 million units in Q2 2008. Today Apple announced it's already sold 1 million 3G units. In 2007 Steve Jobs said he expected 10 million unit sales in 2008.

The new 3G is twice as fast, available all over the world, and (for some people anyway) half the price at $199. So Jobs' 2007 estimate may even be conservative. What do you think - how many iPhones will Apple sell in '08? Click here to make your prediction.

UPDATE: Apple today announced it sold its one millionth iPhone 3G on Sunday, only three days after its launch on Friday, July 11. Here is the rest of its announcement:

iPhone 3G is now available in 21 countries--Australia, Austria, Belgium, Canada, Denmark, Finland, Germany, Hong Kong, Ireland, Italy, Japan, Mexico, Netherlands, New Zealand, Norway, Portugal, Spain, Sweden, Switzerland, UK and the US--and will go on sale in France on July 17.

"iPhone 3G had a stunning opening weekend," said Steve Jobs, Apple's CEO. "It took 74 days to sell the first one million original iPhones, so the new iPhone 3G is clearly off to a great start around the world."

See also: Apple's App Store: 10 Million Downloads Later; and iPhone: The New Personal Computer