Thoughts from a reflective educator.
I've created a list of free multimedia resources for teachers. Some quick research has shown me that there are already some excellent lists of resources out there, but for a variety of topics. This list is intended to compile those lists into one location.
General multimedia:
http://thecleversheep.blogspot.com/2009/02/creative-commons-chaos.html
Here are some ideas for using sound in your classroom to help your students understand concepts through another of their senses.
I've used Audacity many times before, so this was a relatively straight forward activity. Actually, I have even given a presentation where I showed a group of teachers how to use Audacity as part of a workshop on "Using Open Source Software in Education". Very nifty program, definitely a prime example of the power of open source.