Cool videos you got there. Reminds me of the days when I played Doom 1/2 religiously. Still play it now, as a matter of fact. The guy who made those videos was obviously using one of the awesome source ports. Notice colored lighting, mouse look, lense flare from the plasms rifle, etc.
To really juice up Doom check out Doomsday (jDoom) over here: http://www.doomsdayhq.com/news.php
Everybody should get the latest release then check the forums for links to the jDRP (Resource Pack, 3d models, new particles, etc.), JDTP(High Res Texture Pack), jDUI (User Interface updates, better HUD), jDEP (Environmental Pack, fog, lighting, etc.), and to polish it off grab the jdoom-textures addon for enhanced details and fogdoomlights to add much cooler lighting with the high res textures.This comment was edited on Jul 23, 16:42.