Here's an interesting stat I think tells a bigger tale: Onavo is a service for iPhone which claims to shrink your data as it goes in and out, and that service has been monitoring data coming back and forth from its users' iPhones. Spotify, as you probably know, is a music cloud service that recently launched in the US, and Onavo says that iPhone usage for Spotify has spiked since the US launch. In other words, Spotify's iPhone audience has jumped since the service was introduced to the States.
This doesn't mean that iPhone is the only way people use Spotify, as there's no information included about what Spotify's web traffic might be like, or the Mac ap
