Turn your words into animated movies

You type in what you want to say, then it has characters say what you want.  Sounds a bit odd, but it's amusing and interesting to the listener.

http://www.xtranormal.com

Simple voice recording - on the web

On this site, you can record your voice.  It saves it and you can email it to others.  Perhaps explaining to your students specifically want you want them to do on a project.

http://www.vocaroo.com

Great site for tutorials

kahnacademy.org has numerous and informative tutorials/videos to reinforce concepts/topics covered in class

contributed by Mr. Cless

Do a screencast for free

If you want to record how to do something on your computer, you can record it to show it to others at www.screenr.com

It allows up to five minutes of recording.  It works great.  Here is an example.
http://www.screenr.com/R5O8

Good to use if someone is absent, too.