Here is the list of ubuntu based Linux Distributions and Live Cd's and it might be useful for some users.If some thing is missing from this list let me know i will add to this list.

Ubuntu

Ubuntu is a complete Linux-based operating system, freely available with both community and professional support. It is developed by a large community and we invite you to participate too!

Project Homepage
http://www.ubuntu.com/

Downloads
http://www.ubuntu.com/download

full list