Turns out ringtones are sort of like CDs: sure, they're dying, but it's a slow, drawn-out death. And according to Gartner Research, ringtone revenues in the United States are still four times that of all subscription streaming services - combined. That includes Spotify, Rhapsody, Rdio, MOG, or whoever else you can shake a stick at in 2011. But wait: it gets even crazier. Because it turns out that 'mobile personalization' products account for more than 1/3 of total digital music sales. That mostly includes ringtones, but also more