Gamasutra has a story about the latest NPD charts tracking retail sales of PC games in the US. Word is The Sims 3 sold 820,000 retail units in the US in June, almost twice the number of units than were sold during the month by console chart topper PROTOTYPE, which is rarified air for a PC game (though perhaps not as shocking as The Sims 2 Double Deluxe occupying the #3 spot on the chart after two The Sims 3 SKUs). They did a little digging and found EA reported around 700,000 first-month sales for The Sims 2 in 2005, so it seems The Sims 3 sales are actually outpacing those of its predecessor.