-Doom...
      ...Animations
      ...Art
      ...ASCII pictures
      ...Bible
            ...planetdoom.com
            ...Wolfenstein Goodies mirror
      ...Clone Page
      ...Comic Book
      ...Comics
      ...Creations
      ...Crossovers
      ...Cursors
      ...Desktop Themes
      ...in Documentaries, Movies, and TV shows
      ...Editors
      ...Forums
      ...Links
      ...Mods
      ...Mods of the year for...  ... '94, '95, '96, '97, '98, '99, '00, '01, '02, '03, and the best known of '94-'03
      ...Mods in Other Computer Game Engines
      ...Mods in Other Graphics Styles
      ...Movie
      ...in MUGEN
      ...in Mushroom Kingdom Fusion
      ...Patches
      ...Replacement Manuals
      ...Shareware
      ...Source Ports
      ...Utilities
      ...Videos
      ...Wallpapers...
            ...With The Logo
            ...Without The Logo
      ...Wolfenstein 3D in Doom or The Ultimate Doom
-Doom 2...
      ...Animations
      ...Art
      ...ASCII pictures
      ...Clone Page
      ...Comic Book
      ...Comics
      ...Creations
      ...Crossovers
      ...Cursors
      ...Desktop Themes
      ...Editors
      ...Final Doom Mods
      ...Forums
      ...Links
      ...Maximum and Master Levels for Doom 2
      ...Mods
      ...Mods of the year for...  ... '94, '95, '96, '97, '98, '99, '00, '01, '02, '03, and the best known of '94-'03
      ...Mods in Other Computer Game Engines
      ...Mods in Other Graphics Styles
      ...in MUGEN
      ...in Mushroom Kingdom Fusion
      ...Patches
      ...Replacement Manuals
      ...Source Ports
      ...Utilities
      ...Videos
      ...Wallpapers...
            ...With The Logo
            ...Without The Logo
      ...Wolfenstein 3D in Doom 2 For Macintoshes (Very Cool)
      ...Wolfenstein 3D in Doom 2 For PCs (Very Cool)
      ...Wolfenstein 3D in Doom 2 For Other Computers and Playstations (Very Cool)
-Doom 2D!?
-Doom 3...
      ...Animations
      ...Art
      ...ASCII pictures
      ...Comics
      ...Crossovers
      ...Desktop Themes
      ...Editors
      ...Forums
      ...Guide To The Making of Doom 3
      ...Links
      ...Mods
      ...Mods in Other Graphics Styles
      ...Patches
      ...Replacement Manuals
      ...Resurrection of Evil
      ...Utilities
      ...Videos
      ...Wallpapers...
            ...With The Logo
            ...Without The Logo
      ...Wolfenstein 3D in Doom 3?
-Doom Resurrection
-iD Anthology
      This was a boxed product in about 1997 that included all of The iD Software products to that point. It also included the pewter Doom demon and The Doom comic book. I don't know of any places besides amazon.com or ebay.com that might be selling it.
-Fileplanet.com
-Filefactory.com
-Planetdoom.com
-Shareware games
-Source Code
-Source Ports for Doom, Doom 2, and Others
-Steampowered.com
      Buy id Superpack for $69.99 (Does not include the pewter Doom demon, The Doom comic book, Voxelstein 3D, or The 2009 Wolfenstein)
      Buy Doom Pack Complete for $39.99 (Does not include the pewter Doom demon, The Doom comic book, Voxelstein 3D, or The 2009 Wolfenstein)
      I've heard mixed results about the service of steampowered.com downloads.
-Wolfenstein 3D in Doom or The Ultimate Doom
-Wolfenstein 3D in Doom 2 (Very cool)
-Wolfenstein 3D in Doom 3?

Doom Clones

-Doom Clones Dome

-Duke Nukem 3D Clones Dome

-Quake Clones Dome

-Unreal Clones Dome

-Wolfenstein 3D Clones

-Wolfenstein 3D Dome News

Doom Or The Ultimate Doom Mods

Doom 2: Hell on Earth Mods