http://www.vgchartz.com/weekly/40902/USA/It is interesting (if NPD Report finds the same/similar thing) that the final week, prior to Christmas, sales saw:1) +10% increase in Hardware Sales versus the prior week.2) +15% increase in Software Sales versus the prior week.Only the PSP saw a net drop of 2% versus the prior week.Hardware sales in 2011 have been set backs throughout much of the year. It looks to me like December Hardware Sales were very strong.3DS up 16% vrs week ending 17thWII up 18% vrs. week ending 17thThose are the strongest sellers in Hardware.Star Wars Knights of the Old (PC) sold just under 1 million copies in its debut week according to VG Chartz.Of course PC up 319% vs. prior week overall thanks to Star Wars!Globally, PS VITA sold 106,698 copies. That is a drop of 62% versus last week. But, sales of PS VITA globally for the month are thus far 429,186.According to a Motley Fool article the sales of PS VITA globally were just over 70,000. VG Chartz has it at 106,698 (so there is some difference depending on the source).Can't assume the NPD report will reflect VG CHARTZ precisely but at least VG CHARTZ gives you some idea.