Ringtones are turning into a big money-maker for the recording industry. “In 2005, tones pulled in $600 million, 20% ahead of estimates and more than double the 2004 take. The year’s leader, 50 Cent’s Candy Shop, sold 1.9 million downloads, more than the top-selling digital song: Gwen Stefani’s Hollaback Girl, with 1.2 million. As options build and the cellphone is positioned as a digital command post, growth seems inevitable.”