Though the DS leads the PSP by more than 3.2 million units in Japanese market share, the stateside race is a bit closer. By the end of 2005, Nintendo announced it had sold 3.97 million units compared to Sony's "more than 4 million" sold (not shipped) by mid February. I suck with numbers, but me thinks the DS sold well the first month and a half of 2006 and has only continued to do well up to this date with the release of several anticipated games. Keep in mind that UMD's have been selling poorly, so Sony might have a hard time continuing to play the "multi-device" card.
IGN writes: "Whether or not the imminent U.S. release of the 'brain-training' games will capture the dads-and-grandmas market that Nintendo so deftly wooed in Japan is anyone's guess. For now, the Stateside PSP vs. DS fight is shaping up like the Super Nintendo versus Genesis battles of yore -- a tough fight to the finish. And just as long as Sony doesn't debut a 32X add-on, it's likely to stay that way."
Would you liken the DS and PSP US market share to the SNES and Genesis of the early 90's?