Though the Nintendo DS leads in worldwide sales over the PSP, Sony's handheld sells better online through the likes of giant e-tailers like Amazon. From the article: "The PSP Value Pack is the #5 best-selling product at Amazon's Computer and Video Games section, while the Nintendo DS Mario Kart bundle comes in at #10 on the charts."
This is probably due to the PSP's higher adult use, which translates into higher online sales. But the DS has gotten mighty popular over the past several months with the non-kiddie folk due to its huge line-up of games.
