ubuntu, KNOPPIX and gibraltar are some of the distros that were based from debian. i would say it's a cross between slackware and redhat - and that's based from some of my research. i just dont have time to post details
madriva, fedora and the "philippines distro" bayanihan are based from redhat. a very corporate feel and stable distro if you ask me
slackware, which was the basis of openSuSE and vector, is a hobbyist distro basing from its history. althought, its support and community are as stable.