These are some of the better Hell on Earth links I've found:

Natrually the first link would have to be to Pinnacle Inc. the company that makes Hell on Earth.

Gimme Shelter - A Resource Page for Deadlands: Hell on Earth - this is an excellent site that is updated often. Also includes an on-going journal which is fun to keep up with.

Waste of Space - this site has lots of useful info and is one of the sites that has the Deadlands/Hell on Earth timeline (it's HUGE!!!)

DEADLANDS:HELL ON EARTH - aides de jeu,scÕnarios,...- This site is in french, which is a problem for us non-bilingual types, but it has some really cool art work and backgrounds and such (including the dark background I have on the date page).

Ground Zero - Hell On Earth- another good site, lots of info and many little gifs that have festuned my page.