Spotify made a big splash on the streaming music scene when they came to the US after some nice success in Europe. Now they have just released a public beta preview of their BlackBerry app. You need to be a premium Spotify subscriber to use their mobile apps. This preview has some interesting limitations including only working on GSM network devices and has only been officially approved for the Bold 9780, 9700, 9300, 9000, and 8520. Definitely an odd selection of devices but its nice to see that it is in progress.