Analyst Estimates Amazon Sold 500K Kindles in 2008

"Amazon.com has kept its Kindle electronic book reader shrouded in some mystery. The online retailer has said the device is out of stock, but it hasn't said how many were sold. On Tuesday, Citi Investment Research analyst Mark Mahaney offered an educated guess — that Amazon sold 500,000 Kindles last year. That is higher than his previous expectation of 380,000."