Here is what Microsoft had to say regarding the May NDP Data.
"This May, Xbox 360 continued to drive the video games industry, and Xbox 360 users continued to demonstrate their passion for the platform by buying more games and accessories than on any other next-gen console. In fact, U.S. consumers have spent more than two billion dollars on Xbox 360 consoles, games and accessories since November 2006 when our competitors launched their next-gen consoles. This equates to more than twice the sales of our next-gen competitors in that same time frame. In May, more than 154,000 Xbox 360 consoles were sold."
Hit the jump for the complete press release.