We downloaded and are streaming (bit torrent) all six of the working torrents for the latest Ubuntu, Natty Narwhale, which was released this week. The main download page is here: http://www.ubuntu.com/download/ubuntu/download and you can find alternate means of downloading here: http://www.ubuntu.com/download/ubuntu/alternative-download. If you have not tried Ubuntu and would like to see it without changing your computer, download the appropriate file and burn it to CD-ROM to make a Live CD that you can try without altering your computer. You can make a USB boot drive once the CD is booted, which will run faster than the CD runs.