Next Generation has a quick post about NPD's PC games data for 2006. The market was just about even, only increasing by about 1% to $970 million. World of Warcraft and The Sims were the two top-sellers last year, with WoW pushing about a million units and Sims titles occupying five of the top ten slots for the year. From the post: "PC games included, 2006 industry sales were up 18 percent compared to 2005, and 15 percent higher than the $10.5 billion generated in 2002, the former record-holding year. The PC numbers don't include subscriptions and paid online content. The NPD also revealed the top ten US retail PC titles of 2006 by units. WoW beat out second place The Sims 2 by a sizable margin, with EA's hit selling over 598,000 units (list placement includes special editions of applicable titles)."