British National Corpus (BNC)
http://www.itri.brighton.ac.uk/~Adam.Kilgarriff/bnc-readme.html
ftp://ftp.itri.bton.ac.uk/bnc/

Carnegie Mellon FTP CMU_DICT
ftp://ftp.cs.cmu.edu/project/fgdata/dict

COTSE
http://www.cotse.com/tools/wordlists1.htm
http://www.cotse.com/tools/wordlists2.htm

FTP from English/ or DEC-collection/
ftp://nic.funet.fi/pub/unix/security/dictionaries/

Grady Ward's Moby
http://www.dcs.shef.ac.uk/research/ilash/Moby/

International Ispell
http://fmg-www.cs.ucla.edu/geoff/ispell.html

John Chew's Scrabble® Lists
http://www.math.toronto.edu/jjchew/scrabble/lists/

Justin White's Word List 2-10 letters
http://calendarhome.com/wordlist.html

Kevin's Word Lists Page
http://wordlist.sourceforge.net/

More Words 2-28 letters
http://www.morewords.com/wordsbylength/

National Puzzlers' League -- Word Lists
http://www.puzzlers.org//wordlists/dictinfo.php

Our English School Club Word Lists
http://www.esclub.gr/wordoxdictionary.html

Princeton University FTP Wordnet
ftp://ftp.cogsci.princeton.edu/pub/wordnet/

Project Gutenberg (Search on Webster)
http://promo.net/pg/

Scrabble Words TWL98 OSW4 SOWPODS
http://members.shaw.ca/lampwords/dicts.html

Source Forge (see 1 Kevin above)
http://sourceforge.net/projects/wordlist/

The NATO phonetic alphabet
http://www.bckelk.uklinux.net/menu.html

The Serious Scrabble Player
http://personal.riverusers.com/~thegrendel/software.html

University of Cambridge UK FTP
ftp://svr-ftp.eng.cam.ac.uk/pub/comp.speech/dictionaries/

University of North Dakota
http://www.und.nodak.edu/org/crypto/crypto/words/

University of Oxford UK FTP
ftp://ftp.ox.ac.uk/pub/wordlists/dictionaries/

Word Lists (Bryson Ltd)
http://bryson.ltd.uk/wordlist.html

Word lists
http://www.outpost9.com/files/WordLists.html

WordPilot Libraries & Word Lists
http://home.ust.hk/~autolang/Libraries%20and%20WordLists.htm