Myna is the free audio editor offered by Aviary, which also offers photo editing among other useful tools. In the past, I have always stuck with Audacity and, while I am still a fan, I like the fact that Myna is web-based and doesn't require the user to download anything. This would be a great tool for creating student podcasts, practicing foregin language skills, manipulating audio for student projects, etc. Check out this website for some great tutorials to get you started.
Dr. Jessica Pilgreen, Ed.D.