The recent Call of Duty: Black Ops "Escalation" DLC has taken the crown at GameStop as its largest DLC launch ever, according to the company's latest earnings call. The map pack sold 50,000 copies as pre-orders and 200,000 in store during the first week of availability. Digital sales in general are on the rise at the retailer as well, growing 53 percent year-over-year.

The first quarter of 2011 was a good one for GameStop overall, as the company reported record sales of $2.28 billion. HD console games were a big driver, as was the Nintendo 3DS launch, combined with a solid 9.5 percent growth in "pre-owned" (read: used) games and accessories. Pokémon Black and White were the top titles of the quarter, with Mortal Kombat, Marvel vs. Capcom 3, Black Ops and Homefront filling out the top five.