I have mentioned Odeo before, as a place to create podcasts. Ruth Vilmi also writes, on ITForum, "Other useful and simple to use programs are Podomatic. This is very easy to use for online recording, and there are ways to improve the quality. Then there is BubbleShare where you can give a running commentary (photocast) of your picture shows! Some have free demos, and some remain free for the moment. I recommend trying out many before you decide to buy."