In the USA:

Orders/Customer Service: 1-800-idgames (1-800-434-2637)
(24 hours 7 days a week, Closed holidays)

Technical Support: 907-522-1797
(8AM - 12 Midnight EST, Monday - Friday, Closed holidays)

E-mail: suport@idsoftware.com

News:   rec.games.computer.doom.announce  Info/FAQs/reviews about DOOM (Moderated)
        rec.games.computer.doom.help      DOOM Help Service (new players welcome)
        rec.games.computer.doom.misc      Talking about DOOM and id Software
        rec.games.computer.doom.editing   Editing and hacking DOOM-related files
        rec.games.computer.doom.playing   Playing DOOM and user-created levels

Primary FTP Sites and Mirrors:

Official id Software distribution site: ftp.idsoftware.com    192.246.40.6

      Oregon: ftp://ftp.orst.edu/pub/doom/ (Primary Site)     128.193.2.13
  California: ftp://ftp.cdrom.com/pub/doom/                   192.216.222.5
      Taiwan: ftp://nctuccca.edu.tw/PC/games/DOOM/            140.111.1.10
South Africa: ftp://ftp.sun.ac.za/pub/msdos/doom/             146.232.212.21
     Austria: ftp://flinux.tu-graz.ac.at/pub/doom/            129.27.2.237
     Germany: ftp://ftp.uni-erlangen.de/pub/pc/msdos/doom/    131.188.1.43      
 Netherlands: ftp://ftp.sls.wau.nl/pub/msdos/doom/            137.224.127.2
      Sweden: ftp://ftp.luth.se/pub/doom/                     130.240.18.2
  G. Britain: ftp://ftp.dungeon.com/pub/msdos/games/doom/     193.130.144.1


Other id-Related FTP Sites

   Wisconsin: ftp://ftp.uwp.edu/pub/incoming/id/              131.210.1.4
               -various files from users and iD (not organized at all!)
Pennsylvania: ftp://smb130.rh.psu.edu/pub/doom/               128.118.192.69
               -mirror "newwads","deu","multi_doom", & "NEWSTUFF" 
    Missouri: ftp://ftp.wustl.edu/pub/MSDOS_UPLOADS/          128.252.135.4
               -a little of this, a little of that... (a total mess!)
   Australia: ftp://ftp.next.com.au/pub/doom/game             203.8.88.5
               -DOS and SGI versions of DOOM
  G. Britain: ftp://ftp.demon.co.uk/pub/ibmpc/games/id/       158.152.1.44
               -DOOM/DOOM ][ patches


DOOM/id-Related WWW Sites
^^^^^^^^^^^^^^^^^^^^^^

The Doom Help Service (DHS).
DHS:           http://www.cee.hw.ac.uk/~mapleson/doom/doom.html
Help Archive:  http://www.cee.hw.ac.uk/~mapleson/doom/doomhelp.zip

http://www.cedar.buffalo.edu/~kapis-p/doom/DoomGate.html
     -DOOMWeb Node
http://www.cis.ksu.edu/~trm/doom.html
     -DOOMWeb "Tim's" Node
http://www.catt.ncsu.edu/users/deftly/www/doom.html
     -DOOMWeb Node
http://www.cs.hmc.edu/people/tkelly/docs/doom/
     -DOOMWeb Node (not very up-to-date)
http://lilly.ping.de/~sven/doom.html
     -DOOMWeb Node, "Modem Doomer's Hang-Out", lots of links
http://www.cee.hw.ac.uk/~mapleson/doom/doom.html
     -Doom Help Service (DHS)
http://www.york.ac.uk/~mmar1/doom/doom_level_design.html
     -misc. stuff about Doom level design
http://www.montefiore.ulg.ac.be/~quinet/games/doom-en.html
     -Raphael Quinet's DOOM Page (DEU stuff, etc.)
http://www.utk.edu/~williams/bestwads.html
     -lists and links to the "best" .wad files
http://www.cam-orl.co.uk/~fms/dht.html
     -"Doom Honorific Titles"
http://www.mantis.co.uk/doom/
     -"Mantis DOOM Page" - links, etc.
http://cres1.lancs.ac.uk/~esasb1/doom/
     -"The Wadster's Guide"
http://venom.st.hmc.edu/~tkelly/doomfaq/
     -HTML version of the DOOM FAQ
http://www.cmpharm.ucsf.edu/~troyer/sgidoomfaq.html
     -SGI DOOM FAQ
http://jcomm.uoregon.edu/~stevev/Linux-DOOM-FAQ.html
     -Linux DOOM FAQ
ftp://ftp.netcom.com/pub/vh/vhold/doom/doom.html
     -The "Original Unofficial DOOM Site", various links

Special thanks to Mike Newton for compiling the above lists.

