Microsoft has updated it's cloud offering SkyDrive, with 7Gb of free space and Apps for Windows, Mac, iPhone, iPad & Android, allowing you to sync files between all your computers
Other cloud provider offer the following free space; Applie iCloud 5Gb, Google Drive 5Gb, SugarSync 5Gb and Dropbox 2Gb
http://windows.microsoft.com/en-GB/skydrive/download-skydrive