Great tool for recording in the classroom.
Audacity is a great tool to have students creating in your classroom. It's easy to use and teach students how to use. Students are communicating and using technology to create a product rather than spitting out information.
How I Use It
I use Audacity to have students record a public service announcement about insurance. Students complete research on a given type of insurance, write a script, and record their announcement. We used to have students write a research paper on insurance, but not they are doing something more with their research and learning more about technology in the process.