PowerPoint Tutorial #3
 A tutorial about finding, saving, and inserting images from the Internet into your PowerPoint presentation.
 

Understanding Graphics file extensions
jpeg, bmp, npg, what's it all about? http://office.microsoft.com/assistance/2002/articles/oUnderstandGraphicFormats.aspx

Inserting Graphics
http://mum.edu/helpdesk/tutorials/powergraphics.html