Yes, today, according to VGC the PSP finally got a 5 million seller: GTA: Liberty City Stories. The game is arguably the biggest exclusive ( well untill it got ported to the PS2) the system got in its life, and it was released back at the end of 05.
Since then the game is selling steadily in the US, even this week passing the 7k sales. Same is in Others, just that tracking games there is a bit more difficult. Still if you look at top PSP software sales in many countries LCS is still in the top 10, so there is no doubt that the game probably sold more in Others, just that its undertracked.
Also at this point its the best selling 3rd party handheld game of this generation and the best selling non-nintendo handheld game ever :D
http://vgchartz.com/games/game.php?id=5165®ion=All
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