The perfect 10 is here: Ubuntu
Ubuntu has officaly realesed version 10.10 "the perfect 10" Super-fast and great-looking, Ubuntu is a secure, intuitive operating system that powers desktops, servers, netbooks and laptops. Ubuntu is, and always will be, absolutely free. Created by the best open-source experts from all over the world, Ubuntu 10.10 is available in 24 languages and ready for download today.
Aside from the obvious performance upgrades, New features to make note of include the new Unity UI which gives consumers the ability to more easily manage a netbook’s screen real estate by giving easy access to commonly used applications. Other than that we’ve got the introduction of a paid for app marketplace (much like the App Store or Android Market) that will give developers an easy way to access consumers. Another feature included in Ubuntu 10.10 is the addition of multitouch – of course, you’re going to need a machine that has a multitouch enabled display but once you’ve got that coupled with Ubuntu 10.10, you should be golden.
These are just a few of the features but many more are detailed at http://www.ubuntu.com/