SkyDrive for Windows
Just before Google finally released Google Drive cloud storage and sync (see our First Take here), Microsoft made some improvements to its own cloud sync and storage service, SkyDrive, including releasing preview Windows and Mac versions of the SkyDrive app that's already available for Windows Phone and iPhone. (There isn't an official SkyDrive app for Android, but Microsoft has endorsed some of the free Android apps like Browser, Portfolio and Cloud Explorer).