Steve Marx, a Microsoftie who works on Windows Azure, has created a video with narration called What is Windows Azure. Completely drawn by Steve, he starts with a very simple introduction to cloud computing and why we need it and then on to Windows Azure and its components. This video even helped me to get a better understanding of how cloud services work and how we can benefit from them.

<a href="http://video.msn.com/?mkt=en-US&amp;playlist=videoByUuids:uuids:feec9c5d-c6c9-451c-aa9a-b7f4524a6322&amp;showPlaylist=true&amp;from=msnvideo" target="_new" title="What is Windows Azure?">Video: What is Windows Azure?</a>

P.S. You might want to check out the pricing structure of Windows Azure as well.