Box is a secure, hosted service for collaborating and managing files. The Lite version (up to 1GB of space) is free; cost goes up to $15 for each user per month for the Enterprise plan (15GB storage). You need a PC or Mac for some functions, such as sharing files with others. Still, this free application provides access to your Box.net account from the iPhone. An Update button lets you check for new files from collaborators. You can also backup iPhone photos to Box.