Early sales numbers from other phone platform launches include Apple's estimated 500,000 iPhones being snatched up during its launch weekend in 2007, and a million and a half G1 Android phones (the first Android device on the market) being bought up by T-Mobile subscribers in the phone's first six months. Those numbers have since improved with later device launches on the same platform such as the iPhone 3G and 3GS which both hit a million units in their first weekend on sale, as well as the iPhone 4, which sold 1.7 million units in its first weekend. Google too recently pegged Android activations as being north of 200,000 a day.
Story at C-NET
Also noted at The Register