PowerPoint Tutorial
PowerPoint in the Classroom is a great resource for those just learning PowerPoint or those who want to learn more about it and how to use it in the classroom.
It is really easy to use. You can go through it in a specific order by clicking "1" and then clicking "next" when done with each page. Or, you can jump around using the navigation.
This is also a good site to share with students who are starting to learn PowerPoint.