Nintendo on Friday posted results showing a significant slump in console sales from year to year that are likely to have been affected by the iPod touch and iPhone. It shipped 2.5 million DS systems in December, according to NPD data, representing a steep 24 percent drop from the 3.31 million last year. The company claimed to have the best portable console sales of 2010 but was counting rivals like the Sony PSP and not multi-role handhelds.
