Adrian Underhill's Interactive phonemic chart! This excellent teaching tool can be downloaded (see links below) and played full-screen and gives clear audio examples of the English phoneme set.

Phonemic-chart_crop

Note: The chart is flash-based and can be downloaded (see links below). However, you may not be able to open this chart on a mobile device. 

Click on this link to see the American English version

Downloads

Click link to download and view these files