I pose a question for all of you: What makes Ubuntu so great?

Understand that I have used Windows ME, 2000, and XP and continue to still do so and provide support for those systems at work. I have also played around with several Linux flavors including Red Hat, Suse, Gentoo, and my personal favorite for ease of use, Mandrake, or Mandriva as it is now called I believe. I haven’t touched a Linux system, other than Debian running XFCE for my computer science labs, since my move to Mac. If you have used this amazing Ubuntu, please let me know why you like it! Any pertinent articles or personal experiences would be great. I’m always open to new ideas and the community at large seems to be pretty excited about this distro, so I’d like to know what they got right.