If you are interested in setting up a blog for your class, I only know of one service that is available on CMS computers. It is called Edublogs. Here is a link to my edublog that I just started. If you do not want to set up a blog today, just bookmark the site for later.
One of the coolest web applications that I have ever used is called Animoto. Animoto basically takes your pictures and text, sets them to music, and creates an awesome video with cool transitions and effects.
We are going to make an Animoto video today. First watch my example below.
I created this video in less than 20 minutes. I simply found pictures on the web and saved them. I then uploaded the pictures to Animoto, added my text, selected a song, and created the video.