-->PRAAT is a widely used public doman speech analysis program. via google (.edu) via google (.org)

This has a useful lesson plan: http://www.unc.edu/~jlsmith/ling520/praat.html

praat doing Phonetics by Computer by Paul Boersma and David Weenink (main page)
Download the latest Windows (2000, XP, Vista...) version of Praat self-extracting archive
praat5120_winsit.exe (31 October 2009; 2.0 MB)

http://www.fon.hum.uva.nl/praat/manual/Intro_3_1__Viewing_a_spectrogram.html
To see the spectral content of a sound as a function of time, select a Sound or LongSound object and choose Edit. A SoundEditor or LongSoundEditor window will appear on your screen. In the entire bottom half of this window you will see a greyish image, which is called a spectrogram. If you do not see it, choose Show spectrogram from the Spectrogram menu.

MY DEMO (25 NOV 2009) "Where in the world is Osama?"

I moved my praat folder from downloads to my speech folder.
Open praat
Documents/speech/praat folder/praat.exe

View a spectrogram from a file I already created
Praat objects
..................Read / Read from file / WAV file osama osaaama MKG
..................Play / Edit to view spectrogram

Create a new file in class
Praat objects
............New / Record Stereo Sound / tick max Hz / Record .........
? use windows mixer without meteres
.........................."Osama Osaaaama"
..........................Play / Save to list and Close
OR
...........................File / Write to WAV file
.........................................osama osaaama stereo MKG.wav
...........................File/Close
Compare objects you create.

------------------ Links pointing here from course syllabi:
ESL articulation on the telephone wiki
Physics unit on work and energy wiki