Can be used to post questions to students, which they can access via computer or any other type of i-pad, i-phone or android. Also can be used for real time responses during class
This site has how to videos for many of the sites I have seen mentioned. There are 5-min clips of how to set up and use the different applications that we find on the web but don't necessarily know how to get started on. I watched a couple of these, but especially liked the one about KidBlog and Animoto.