You can create audio files for publishing on the internet very easily using an open source software application like Audacity. You may also want to have an MP3 player recorder like the iRiver 20X which will enable you to have portability with your audio files.
Richmond College created the following PhotoStory about using iRivers for the 2007 Quality Awards. You might get some ideas from their experience.
Activity: try creating an audio file using Audacity and export as an MP3 to the iRiver MP3 Activity : demonstrate recording using the iRiver and then uploading into Audacity