I just install Fedora 11 into my 5 years old machine. Its have been for a while because i usually install Ubuntu into my machine this couple years. Previously i usually install Fedora, n guess what i have been using Linux since Redhat 1 and that is my first introduction to Linux.
Fedora website : http://fedoraproject.org
Ubuntu Website : http://www.ubuntu.com
Redhat Website : http://www.redhat.com