well if your looking for a list of comic book universes try this one,
http://blaklion.best.vwh.net/time_links.htmlthe cosmology compendium! (one of my fav sites) the list includes both marvel and dc universes with others thrown in (ABC universe, alan moores Awesome comics universe, and the seventies atlas comics methinks). it even has timelines on the worlds!!! fun!
alas it doesnt provide me with a pre crisis earth 1 timeline or a marvel timeline which i would love to browse (yep im a dork)
and if you are interested, heres the definitive timeline of Earth-0, the post zero hour earth
http://dcu.smartmemes.com/