This looks like something very useful, for families and for schools.
ShowMeWhatsWrong is a free screen-casting service. You input your Name and email address and SMWW generates a URL, then send the resulting URL to whoever needs to show you a problem. This URL takes them to the ShowMeWhatsWrong website where you can record up to 5 mins of screencasting, which gets posted to you so that you can see the problem.
Thanks to Tom Byrne (Free Technology for Teachers) for the link.