Amazon has updated their Cloud Drive service to support file syncing, a step that is desperately needed for the service to become a viable alternative to SkyDrive and Dropbox. Cloud Drive originally launched in May of last year without file syncing capabilities, meaning that files had to be manually placed in the Cloud Drive and updated after editing.
Today's update brings with it the ability for files and folders to sync across all of your linked Cloud Drive devices. Amazon is still offering 5GB of free storage for users, so now may be as good as time as any to switch. You can learn more and download Cloud Drive from Amazon's website.