Some phonetics links:

 SIL Home Page  --includes information about styles of language learning, software such as IPA fonts

These sites include audio files linked to the IPA or other representation of a sound:

An introduction to the sounds of languages based on Peter Ladefoged, Vowels and Consonants

The sounds of Ladefoged, A Course in Phonetics
A complete pronuciation guide to the IPA alphabet. Most of the materials are directed towards English sounds, but there are also samples of  French vowels and uvulars, German vowels, Greek, Hausa consonants, Italian, Vietnamese, and Xhosa, and other languages..

Sounds from Additional Languages
UCLA Phonetics archive. Many languages are included, including Akan, Arabic, Dutch, Greek, Hebrew, Polish, Russian, and Yoruba.