http://lists.gento.org/ has no mailing list information. It just shows the main Gentoo web page.
http://lists.gentoo.org/ is still broken, but the links from http://www.gentoo.org/ are all better now. (They go to http://www.gentoo.org/index-mailinglists.html, which has all the good stuff on would expect from a page about the mailing lists.)