Below are useful Web sites with helpful charts and sound files.
Sound files
Index of Sounds. Extensive index of sounds from Peter Ladefoged's UCLA archive.
Handbook of the IPA: Sound Recordings
General phonetics resources
Peter Ladefoged's personal webpage.
International Phonetic Association
Linguistics Handbook. University of Victoria Department of Linguistics.
Charis SIL Font. Available for free download.
Praat. Computer tool for linguistics available for free download.