Speaking

• http://www.clc.com.hk/material/sound.html
  A comprehensive introduction to the Cantonese sound system.

• http://cantonese.ca/pronunciation.html
  A pronunciation guide giving useful phonetic information about Cantonese consonants and vowels.

• http://wikitravel.org/en/Cantonese_phrasebook
  This Wikitravel article includes a pronunciation guide and phrase list.

• http://www.cbs.polyu.edu.hk/VTP/hkword/main.htm (in Chinese)
  “Cantonese Tones” constructed by the Hong Kong Polytechnic University gives an introduction to the Cantonese sound system and rules of pronunciation.