Dictionary.com is a resource that can be used to hear how certain words are pronounced. After searching for a word, the site provides the word, the definition, part of speech and a button allowing users to hear the proper pronunciation of the word.
Forvo.com is another resource to help with learning pronunciation. Forvo allows multiple language searches so that a listener may hear a word pronounced in the language of their choice. Forvo also allows fluent speakers to make their own pronunciations to send in. If a word doesn't have an available pronunciation, visitors to the site may provide one.