Bob Larkin has let me know that he has begun to add a plethora of megawads to the Megawads page at the Doom Wad Station. This promises to be a more friendly and comprehensive source for megawad information than the archives we all should know and love.
Included in the list were previously missed classics such as Hell Revealed, Requiem, Icarus as well as Hell In Hell and Realms of Chaos. I am, in fact still in the process of adding more such as Beyond Doom, Farewell to Doom, The Experiment, Herian and Herian 2 and many more. This should all be completed sometime today.