I'm working on a small compilation site to assist people that are unfamiliar with all that the doom community has to offer with some great megawads, deathmatch wads, and single levels that are all worthy of introducing them to our world.
In other words, list em! I'll screenshot 'em add 'em and sort 'em!
it will eventually be http://www.jerrylehr.com/personal/Doom
and possibly if large enough http://www.megawads.com
there's a crappy intro and a lot of unfinished pages, I'm working on the megawads section at the moment... just needed some more qualified help