The "We're No. 1!" trend continued as Activision claimed the top PC spot -- a market where it holds three of the top 10 best-selling titles -- with World of Warcraft: Wrath of the Lich King. Crash Bandicoot Nitro Kart, according to figures provided by Apple, remains the top paid app for iPhone / iPod Touch, though the company didn't clarify whether that is in dollars or copies downloaded. What about Call of Duty ? It did well enough to earn a brief mention in the publisher's earning statement, with publishing CEO Mike Griffith announcing that Call of Duty 4 has officially sold 13 million copies worldwide during the investor call. The franchise will likely have a much larger presence in the quarter following Modern Warfare 2 's release.