VGChartz reports Modern Warfare 2 is selling impressively well, it's estimated that the game already sold over 7 million copies the first day it was on the market:
VGChartz preliminary day one figures puts the sales to date (including the midnight launches) at over 7 million copies worldwide across Xbox 360, PS3 and PC. Around 55% of sales are on Xbox 360, 33% on PS3 and the remaining 12% on PC. In terms of regional breakdowns, over 4.2 million units were sold in the Americas (3.7 million USA), 1.2 million in the UK and 350,000 each in France and Germany.
Based on the day one figures and the Tuesday release, week one figures should come in at close to ten million units which smashes the 5.92 million week one record set by Grand Theft Auto 4 last year and positions Modern Warfare 2 as the most successful game launch of all time.