Alternatives to PowerPoint!

This is a more interactive approach to creating slides.  There all have very easy and nice tutorials to walk you through creating one,  as well as already created projects/templates you can mashup.

http://prezi.com/

This is visual and interactive board were the user can add multiple items, text and sound. 

http://www.glogster.com/

This allows you to create animated presentations, similar to cartoon animations. 

http://www.powtoon.com/