Very much like Google Drive or Dropbox, Microsoft's SkyDrive app lets you store files in the cloud, so you can access them from anywhere, on any of your devices, regardless of the platform they're running. It also lets you share documents with collaborators and view documents that have been shared with you. The app is free to download, and users with Microsoft accounts get 7GB of free storage to start.
Open up the SkyDrive app on your Windows Phone device and you'll see a sleek, minimalist interface, displaying all of your files and folders in either a list or tiled layout. A quick swipe in either direction brings up pages for Recent and Shared files, while the ever-present, though not at all intrusive, toolbar gives you options to create a folder and move, search, add, and share files. Altogether, it's a simple interface that looks as good as it functions.
The "+" button on the toolbar makes it easy to upload a photo or video right from your device into your SkyDrive. You can even set your device to automatically upload photos to the cloud as you take them, which is hugely convenient. From the Office app, you can save any new files directly to SkyDrive as well.
Organizing files in SkyDrive is a snap, as the app offers two different ways -- both of which are intuitive -- to move files around. You can either long press a file or folder, or use the checklist to select multiple items before moving them. And of course, you can rename, delete, and share items as well.