Think using the cloud is all about backing up files? Think again. File-storage services such as Dropbox and Box.net are likely the first cloud services that come to mind, but these days people are increasingly using cloud-based Web platforms and mobile apps for various purposes.
Just as Google Play Music automatically syncs your song collection across the cloud, your desktop, and your mobile devices, many other great apps and services can give you instant access to all sorts of things, including deals, files, news, photos, and more. Here's a look at 20 of the most interesting offerings.