Compares prices on a product by using REST robots that searches Froogle, EBay and Yahoo Shopping. The demo uses JSP to call the robots, parse the returned XML, sort the result and present the result.  

Digg that contains just stories from specific topics and/or with specfic keywords. The demo is built using one REST robot that retreives the story topics from Digg and one RSS robot that creates the RSS feed.  This is a good example of how to use both REST robots with JSON output and RSS robots. Robots and the full source code are of course ...