Box allows you to store and share content online. Files and folders can be shared as web links, files and folders can be synced from the desktop. This means that files can be automatically backed up from multiple computers/devices, and stored on the Box server. It provides searching tools, and the ability to view files without downloading.
Box supports standard web browsers and mobile devices such as Android, iPhone and iPad. It can be automatically accessed through a variety of other mobile apps, and it integrates with other collaboration software such as Google Docs, Gmail, Microsoft Sharepoint, etc. Box.net allows free use of up to 5 GB of storage, and has pricing plans for enterprise capabilities, larger storage use and some additional features such as versioning, encrypted storage, etc.