Facts :

• Selected Vocabulary Differences Between British and American English (uta.fi)

• American Culture and Language - England / USA vocabulary : differences (ilv.ucl.ac.be)

• Differences (peak.org)
  Why are there differences?
  Culture / Vocabulary / Idiom – oblique sayings / Grammar / Usage / Spelling / Punctuation & Symbols
  Geography / Time (extinct — obsolete — archaic — current)
  Jargon / Swear Words / Rhyming Slang, Cockney Rhyming Slang, and Backslang
  Translations / A Spot of Linguistics
  Canadian (World English)
  Obligatory Humour

• American and British English differences (Wikipedia)
  1 Historical background
  2 Pronunciation
  3 Grammar
  4 Word derivation and compounds
  5 Lexis
  6 Writing
  7 Keyboards...

• Declaration of Revocation by John Cleese (transversaltruth.blogspot.com) - Lien modifié
  "Her Sovereign Majesty Queen Elizabeth II will resume monarchical duties over all states, commonwealths and other territories.
  Except Utah, which she does not fancy...
  
  
  
  
• US 2 UK - A guide on the differences between American and English culture (us2uk.tripod.com)
  
  
  
  

Listening :

• Choose a city and learn to talk like the locals. (slanguage.com)
  
  

• fonetiks.org - The online language laboratory (avec différents accents) - (fonetiks.org)

Vocabulary :

• Differences between British English and American English. - a glossary (britainusa.com)

• A BRIEF ENGLISH-AMERICAN DICTIONARY (traditions-uk)

• What are the differences between British English and American English? (Woodlands Junior School)

• The English-to-American Dictionary (english2american)

• The Best of British - The American's guide to speaking British (effingpot) :
  "The seven sections (Slang - People - Motoring - Clothing - Around the house - Food & drink - Odds & sods)
  contain over 1000 words and expressions that differ in their usage between the US and the UK."
  
  
  
  
• British/North American Vocabulary - Main differences (englishclub.com)

• Common Words in American and British English (www2.gsu.edu)

• British, Canadian and American Vocabulary (www3.telus.net)

• British and American Car Words (frank_esl2000)

• Information: US to UK Cooking Conversions, Food Names - (hostelscentral.com)
  ex : "In the UK, when they say: Aubergine, In the US, it means: Eggplant"
  
  

• Cooking Measures and Conversion Calculator with British and U.S. Cooking Terms
  (Global Gourmet)
  
  

• Measures and Weights (englisch hilfen.de) :
  Linear measures -
  Nautical measures -
  Liquid measures of capacity (BRITISH and AMERICAN) -
  Avoirdupois weights -
  Temperature conversion

Grammar :

• American vs. British Grammar (englishplus.com)

INTERACTIVE exercises :

• British and American English - interactive exercise (British Council)

• British English or American English?
  "Is it Father Christmas or Santa Claus?
  The answer depends on which side of the Atlantic you are."
  - Activities created by Renée Maufroid :
  Matching - Flashcards (Java / non-Java) - Concentration - Word Search
  
  

• British - American English - interactive exercises (englisch hilfen.de)

• British/American Quiz (englishclub.com)
  "Match a British English word on the left with an American English word on the right."

• Idem (englishclub.com)

INTERACTIVE games :

• In the bathroom - interactive crossword (BBC)
  
  

Games TO PRINT :

• British and American English - a crossword
  "Complete the crossword with the American English equivalent of the British English words."
  - with Teacher's Notes
  (Inside Out)

Songs :

• Let's call the whole thing off - sung by Fred Astaire - Listen to it! (themillstone.blogspot.com)
  Differences British English / American English
  - with the lyrics :
  "You say eether and I say eyether,
  You say neether and I say nyther..."
  (lyricsdepot.com)

• Englishman In New York by Sting :
  "I don't drink coffee I take tea my dear
  I like my toast done on one side
  And you can hear it in my accent when I talk
  I'm an Englishman in New York"