Check out SnapCrowd - Skydrive/Dropbox Competitor 10GB FREE storage

Snapcrowd just released their windows phone app and for a limited time the free account has 10gb of storage for your photos, songs, videos and documents.

The website is very METRO and is what skydrive really should be in terms of UI.

The wp7 app can stream your songs and its baked into the zunehub as well

Snapcrowd demo

wp7 app