Click to Release features a number of very cool experiments using HTML5 (which means that you should probably use the Chrome browser to view these demos).
Urban Arteries uses the Google Maps API, three.js and what I can only guess is black magic to create a 3D view of the city around you using just the major road arteries around your location.
The app automatically detects your location but you can also use any address or use the quick links provided to see some of the major cities.
WebGL Google Street Viewer lets you explore Google Maps Street Views around the world without Flash.
I couldn't get the WebGL Weather Globe to run on my steam driven laptop but I think it uses the recently added weather data on Google Maps and places it on the Google Data Arts Team WebGL Globe. The screenshot looks cool anyway.