Dropbox is a free online data backup & syncing application. It lets you bring all your photos, docs, and videos anywhere. After you install Dropbox on your computer, any file you save to your Dropbox will automatically save to all your computers, your Android device, and even the Dropbox website! With the Dropbox app, you can take everything that matters to you on the go.
Evernote aims to give everyone the ability to easily capture any moment, idea, inspiration, or experience whenever they want using whichever device or platform they find most convenient, and then to make all of that information easy to find.
SugarSync is an all-in-one file backup and synchronization service that offers real-time file sync, automatic backup and mobile access for your files, music and photos. [30-day free trial]
Box.net provides a secure, easy way for businesses to manage content, share large files and collaborate online from anywhere. [14-day free trial]