If you are looking for a fast, feature-rich, easy-to-use, good-looking Desktop Linux distribution for replacing Windows, Elementary OS is what you need. Designed from the ground-up as an free replacement for Windows on the PC and OS X on the Mac, Elementary OS comes bundled with everything you'd expect from an ready-to-go OS after install which includes an excellent suite of custom tailored apps like a fast web browser, an app store with thousands of apps, free security-updates for life, music-player and organizer, all-in-one Jabber, Facebook, Google Talk, AIM, IRC, Yahoo! etc. instant messenger, multi-account modern desktop email-client, photo-organizer-editor and much more.
Elementary OS Luna not only looks beautiful but has also been engineered from the core to be light on system resources. It boots-up quickly, logs you in instantly, and uses the bare minimum of resources so that your apps enjoy a speed boost as well. Do watch the introduction video posted ahead.