NPD Group reports a record-breaking year in video game sales. Video game sales topped $17 billion last year, according to the NPD Group, making 2007 by far the biggest year in gaming history. These numbers mark a 43 percent increase year over year, solidifying the games industry"s strong lead in growth over movie box office revenue, which totaled $9.7 billion at a 4 percent increase. Holiday shoppers made December the most lucrative month of all. Sales of both the Wii and Xbox 360 were strong, but it was the Nintendo DS that posted the biggest December totals, with a staggering 2.5 million systems ending up under trees nationwide. Over on the PS3, December saw a strong rise, but the more expensive system still tailed its competition. No prizes for guessing the top-selling game of the year, though: Halo 3 wound up shifting just short of 5 million copies.