The Sounds of Language
This page has recordings of all the sounds in the complete IPA chart, and not just the English sounds: .
Here  is an example of an assignment of English vowel sounds to IPA symbols. And, to emphasize the idea that it's very dependent on region, here  is a (rather difficult) study on regional variations in the United States.
Here's a nice copy of the IPA chart from class: . In this chart, they use a different symbol for the sh, ch, zh, and j sounds.
You can reach Jason at email@example.com with questions about this lesson.