More Classic Doom-related links:

Get Doom95 shareware - DOOM95.ZIP, 4.5Mb
Get Doom95 mouse driver (info here) - DMOUSE.ZIP, 1k
Get Doom95 record-demo patch (info here) - DM95FIX.ZIP, 50k
Doomed Speed Demos Archive - Demos for huge variety of third-party PWADs
Doom2.net - More information on the original PC games
Classic Games Resurrected: Doom - More Doom info and some useful links
Doomgate.de - German-language multi-platform Doom site
rome.ro - John Romero's Home page
Aubrey Hodges - Composer of the PSX Doom soundtrack and Doom 64 soundtrack
Doom and Doom II remixed-music projects from OverClocked ReMix