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(Credit: JB Hi-Fi)
JB Hi-Fi Now
JB Hi-Fi Now is a music-streaming service, which has now made its way to Windows Phone. The app has offline synchronisation, meaning that you can throw a few albums onto your mobile device and take it with you on a flight, for example.
If you need a file-sync-and-share cloud that you can control, you can connect devices to a private ownCloud server running in your datacentre. It seems as though there are still a few bugs to work out in the app, but the idea is sound.