Mobile analytics firm, Flurry, has tracked Droid sales to be 250,000 in its first week which they calll a  strong result for Motorola and Verizon. Although it was not as spectacular as the iPhone 3G, it showed the Droid is the fastest-selling Android phone to date.

Compared to the myTouch 3G on T-Mobile, Droid outsold it by more than four times. Verizon has nearly 90 million subscribers to T-Mobile's 34 million. Verizon has a $100 million campaign.  Motorola forecastsits own Droid sales at one million through the end of the year or an ad cost of $100 per handset sold.

Flurry notes that Verizon's aggressive campaign adn 3G network advantage in key, populous regions of the country like the Northeast, position the Droid as a legitimate challenger to the iPhone.