Sodaphonic is a free online audio recording and editing tool. It's easy to use and can be used without creating an account on the site.
To create a recording on Sodaphonic simply head to the site and click on "start new project." As soon as you do that you'll be in the Sodaphonic audio editor where you can click the record button to start recording yourself talking, singing, or banging a drum. When you're done recording you can then use the editing tools to cut and trim sections of your recording. The editing tools also include a couple of effects for fading and otherwise adjusting the volume of your audio track.
Completed Sodaphonic recordings can be saved directly on your computer as MP3 files or saved to a Dropbox account.
Applications for Education
Sodaphonic is a tool that I'll add to my list of registration-free audio recording tools. Students and teachers could use Sodaphonic to create short recordings to include in slideshows or to publish as short podcasts.