Here are some examples of just an image slideshow:
http://www.gridviewguy.com/ArticleDetails.aspx?articleID=298
SlideShowControl
If you wanted to use Flash, you could create a slideshow in Flash and then use the OBJECT or EMBED HTML tag syntax to display the flash movie.
If you were going to use a Powerpoint slideshow, then I would look into sending a file down to the browser and letting the client determine how to display *.ppt files.
Does any of this help? If not, let me know I will work on getting a small demo together for it. I will need to get more from you as to what exactly you are looking to do.
There are only 10 types of people in the world: Those who understand binary, and those who don't