This is a really wonderful tool to create short audio recordings and share them with your students on your classroom blog/site/wiki. The process is very easy and all it takes is a sign-up and the service is free of charge. One good thing about soundCloud and which you can use with your students is that this tool allows you to add comments to any given moments in the podcast. This could be used by students to give feedback and share comments with each other.
Vocaroo is another awesome web tool to record and share audio clips. Vocaroo does not require any sing-up or software download, just head over to its homepage, and click on record and after you finish you will be provided with links to share your recording with others. Vocaroo also generates a QR code for your podcast.
If you are looking for educational podcasts to help you in your professional growth , this list could of great help.