"Some 69% of online Americans use webmail services, store data online, or use software programs such as word processing applications whose functionality is located on the web. Online users who take advantage of cloud applications say they like the convenience of having access to data and applications from any Web-connected device.
When asked why they use the different services that store personal information on the web, users cite a range of reasons that have mostly to do with ease and flexibility. They like how such services enable them to share data with others and let them easily access their data from any computer."
Thanks to beSpacific for pointing out this story: Pew Survey: Use of Cloud Computing Applications and Services.