TLWater for the presentation of T&L at the GeForce 2
A presentation video of the GeForce2 GTS shows a pool in which light is reflected and refracted on the surface of the water. The program on which this is based is called TLWater and is primarily intended to show hardware-accelerated Transfrom & Lighting.
This program, which is just 570kb in size, can be downloaded here. I have an average of 30fps in the demo, not much, but at least something.
Besides TLWater you can find two other programs on this page. One to show environment-mapped bump mapping and another one where you can interact with objects.