After yesterday’s release of the top 20 video games for December 2008, the NPD Group today gave Gamasutra an extended list showing the top 20 console and handheld titles for the same month. Software for Nintendo’s platforms — the Wii and the Nintendo DS — took six of the top 10 positions on the chart. As shown by the extended chart, those same platforms also claimed seven more positions on this expanded list of best-selling …