Dropbox is a free service that lets you bring your photos, docs, and videos anywhere and share them easily.
Google Drive -- Keep Everything. Share anything.
Available from your Google Account.
Synchronize sync music, photo files across PC, Mac and mobile phone: Remote pc file access from any mobile phone, and perform backup storage
Store photos and docs online. Access them from any PC, Mac or phone. Create and work together on Word, Excel or PowerPoint documents.