PlanetXbox is reporting that The NPD Group has stated the Xbox and Halo are selling tremendously well. PlanetXbox's story reads:

The Xbox video game system from Microsoft had the best-selling video game console launch on record after two weeks of sales, according to The NPD Group Inc., the definitive source for sales and market data on the video game industry.

The data clearly show that Xbox is off to a torrid start, said Robbie Bach, chief Xbox officer at Microsoft. Xbox sold out as soon as we launched, and we're selling systems as fast as we can produce them. More than 100,000 units a week are being delivered to retailers, so game players are likely to find Xbox systems throughout the holiday season. With one of the best launch lineups ever, I understand why Xbox is the most sought-after gift for the holiday.

Most importantly, Xbox purchasers can't get enough of the Xbox launch games. According to The NPD Group, gamers are buying 2.4 Xbox games with every Xbox, resulting in the highest game attach rate ever recorded for a console at launch. Sony Computer Entertainment America Inc. sold 1.9 games with every PlayStation 2 during the first two weeks of its launch last year, and Nintendo Company Ltd. has sold 1.9 games with every GameCube to date.

The NPD Group also claims that Halo is the Xbox's best-selling game and is even selling more than Luigi's Mansion for Nintendo's GameCube.