According to Nintendo, the DS has sold a total of 6 million systems compared to the PSP's 4.25 million in total sales. Granted, the PSP was released several months after the DS, but no one can deny the recent moment and sales surge of the DS given its stellar line up of games.
In addition, Nintendo still dominates the portable games market. From the article: "Nintendo currently owns 72% of the handheld market, with Game Boy Advance at 41%, Nintendo DS at 31%, and PSP at 28%."
