Speaking - Phonetics

Pronunciation of the -ed ending Explanations and exercises by michelle, including 2 pages of useful sentences with their audio
Pronunciation of the -ed ending 02 - more stuff plus links to on-line exercises
Phonetics in the Classroom: Phonetics 01 (1 page)
Understanding the vowels (4 pages) by michelle (2006)

Perfect Pronunciation Exercises (US American)
Practice Pronunciation with the BBC (British English)
Tongue Twisters

Dictionary with audios: Merriam-Webster On-line (English-English). Click on the loudspeaker and you'll listen to the pronunciation of the word (US American).
Pronunciation differences US/UK Englishes
Sounds familiar? Accents and dialects of the UK (British Library) Link sent by Gonzalo (Y5, 2007-08)

AN AMAZING EXTERNAL LINK: Learn how sounds sound!, their transcription, and more things! Click on the Lauch English Library (on the right of the screen) and learn it all about the phonemic system!