Discovery news has a story about robot that runs over water. From the article:
em>A robot that can speed across the surface of water like a lizard could open the door for multi-legged amphibious robots.
The Water Runner, being developed by assistant professor Metin Sitti at Carnegie Mellon University in Pittsburgh, could search for victims in flooded disaster areas, be equipped with biochemical sensors to monitor water quality, or use tiny cameras to survey coastline security zones or ports.
It got very good applications. Read the completer article here