Let's try heatmap.js to generate web heatmaps with the html5canvas element. This makes it easy to show event data on a map or click data for a web page. It's a new library, so we may find some bugs in it, but it should be fun to play with.
Bring your laptop with a modern browser. This library requires Firefox 3.6+, Chrome 10, Safari 5, Opera 11, or IE 9+.