Translation devices

SYSTRAN BABEL FISH TRANSLATOR, for text and web pages. http://world.altavista.com
SYSTRANBOX, for text and web pages. http://www.systranbox.com
REVERSO, for text and web pages. http://www.reverso.net

Bilingual dictionaries

WORDREFERENCE, with Collins Dictionaries. http://wordreference.com
EURODICAUTOM, from the European Commission. http://europa.eu.int/eurodicautom
ECTACO. http://www.ectaco.com/online
ONELOOK. http://www.onelook.com
LOGOS. http://www.logos.it/lang/transl_en.html

Monolingual dictionaries (English)

MERRIAM WEBSTER, English. http://m-w.com
CAMBRIDGE DICTIONARIES. http://dictionary.cambridge.org
THE AMERICAN HERITAGE DICTIONARY OF THE ENGLISH LANGUAGE. http://www.bartleby.com/61/
COLUMBIA ENCYCLOPEDIA. http://www.bartleby.com/65/
WORDSMITH. http://www.wordsmyth.net

Monolingual dictionaries (other languages)

DICTIONARY.COM. http://dictionary.reference.com/
TRAVLANG. http://dictionaries.travlang.com

Courses

BBC. http://www.bbc.co.uk/languages/index.shtml

Everything about language: dictionaries, courses, linguistics, translators...

YOUR DICTIONARY.COM. http://www.yourdictionary.com/languages.html
I LOVE LANGUAGES. http://www.ilovelanguages.com/index.php?category=Languages
WORD2WORD. http://www.word2word.com
UNIVERSITY OF OREGON, YAMADA LANG. CENTER. http://babel.uoregon.edu/yamada/guides.html
WORDLANGUAGE. http://www.worldlanguage.com/Languages
ULTRALINGUA. http://www.ultralingua.net/
FOREIGNWORD. http://www.foreignword.com

Other resources

TEXTCAT LANGUAGE GUESSER, identifies the language. http://odur.let.rug.nl/~vannoord/TextCat/Demo/textcat.html
INTERNATIONAL PHONETIC ALPHABET. http://web.uvic.ca/ling/coursework/phonlab/ipatut/index.html
FONTS. http://www.sil.org/computing/fonts/
VERB CONJUGATOR. http://www.verba.org/owa-v/verba_dba.verba_main.create_page?lang=en
NEWSPAPERS AND MAGAZINES BY COUNTRY. http://www.metagrid.com/  , http://www.kidon.com/media-link/index.shtml