On of the best products I saw at CES in 2006 were digital photo frames. Now two years later they are everywhere. (I especially noticed them being pushed as a Christmas gift last month.) CES 2008 was infested with different digital frames. I think they provide a wonderful way to show before and after photos etc in the dental office.
They are still a bit pricey at $200 or more for a decent size. In addition if you really want to make an impact you can go with what is promoted as an Advertising Frame; which is really just an extra large (20 inch and bigger) digital frame.
The new frames can display video and sound as well as still digital images. Check out Izzy here for products and details