Here is a collection of demos on Infinispan:
And a YouTube Channel with Infinispan-related videos and screencasts:
Finally, here's some ideas of demos that could be built:
A common example of a data grid is when an online shopping site needs to maintain a cart with the products a user has bought. The reason for wanting a data grid here is to make sure cart contents survive any failures. A very simple GWT based cart could be created starting from the GWT tutorial, and talking REST to an Infinispan REST server, or websockets to a Infinispan Websocket server. The idea would be for users to buy a certain number of articles and to maintain an updated value of the cart. You could use this demo to verify failure recovery when a node goes down, and when a entire site goes down, showing RELAY in action.