Learn how to burn a DVD from your laptop using either moviemaker or Windows DVD Burner. A few teachers have used this in conjunction with Screen-cast-o-matic.com or the SMARTboard Recording Software to record their screens while they lecture through PowerPoint slides. Then they burned their recording to a DVD and left it behind for a sub to play in their class when they were out. Give it a try, and let us know how we can help you!
***** For Math and Science Teachers: You could also connect your document camera to moviemaker and record yourself working through a problem and then make a DVD to show to your class. We have another tutorial that shows you how to do this.
*Uploading to YouTube (Vimeo, TeacherTube, etc) is also an option if you are posting this video to your calendar or looking to flip your classroom.