SugarSync 4.7.0 for iPhone - Download
All of the content on your hard drive just a click away
Basically, the application allows you to easily back-up your photos and text documents so that you can then access it from your iOS device without having to download anything.
Before using the app, you'll need to create an account. You won't have a lot of storage space by default, but if you like the service, you can purchase a 30 GB storage plan from within the app.
SugarSync is a comprehensive cloud storage service that manages to compete successfully against Skydrive, Google Drive, and even iCloud.