Today sees the release of the latest version of Ubuntu for Desktop, netbook and server.
Ubuntu will always be free. It ships loads of software to do pretty much everything most people would want (Open office (Open source MS office alternative) , Rhythmbox (open source iTunes alternative). Thousands of other free games/applications available in the Software centre.
Boots in less than 10 seconds on my laptop.
Download it, try it (runs from CD without installing on your computer, though it will be much slower than running it after an install).
Happy Hitchhiker's Guide day! (10/10/10 = 101010 = 42 in binary :)
Interesting blog post: "10 things to do after installing Ubuntu 10.10 Maverick Meerkat":