Larry Ferlazzo wrote a good post about how he is using Clyp.it to have his ELL students create and share short audio recordings. His post even includes an example from a student. I had not heard of Clyp.it prior to reading Larry's post so I had to try it out.
Clyp.it is the second easiest-to-use audio recording tool that I've used. The easiest to use is still Vocaroo. To record on Clyp.it you simply go to the website and click the big record button (you may have to allow pop-ups in your browser in order for Clyp.it to access your microphone). When you're done recording click the share button and you'll be taken to a page on which you can download your recording or grab an embed code to post the recording on a blog. In the video embedded below I provide a demonstration of how to use Clyp.it in your web browser.
Clyp.it is also available to use as a free iOS app or as a free Android app.
Applications for Education
I encourage you to read Larry Ferlazzo's post about how he is using Clyp.it with his ELL students. In that post he explains how his students are using Clyp.it to post audio comments on a classroom blog.