uploader plugin

Hi guys/gals, i am a teacher and have created a podcast series for my class using wordpress. Now i am tying to find a way for the pupils to upload their work directly to the site.
I have looked around for a plugin and have found one by:
http://www.boxofchocolates.nl/log/?page_id=83
but am having trouble with it.
Has anyone had any experience in this area or can recommend a good way for me to go?
Many thanks
Jonnie