One of iCloud’s coolest features, Back to My Back, began life as a seldom-discussed MobileMe service. We think it deserves to be a bigger deal. With Back to My Mac, you can access your Mac’s hard drive and swap files from any internet-connected Mac running OS X 10.7.2. You can also use Screen Sharing to open applications and edit files on another Mac, to access other machines on your home network, or even to upload important files to iCloud.com.