If you really want to see a cool “Web 2.0” application, look no further than this sweet visual world / global chat system built by The Midnight Coders. It pretty much freaking rocks.
From the site:
This example demonstrates bi-directional messaging between heterogeneous (Flash and AJAX) clients and WebORB Message Server. The server performs additional processing to geolocate chat users, injects necessary information in messages so users can plotted on the map.
Type your message in the text field below and press Enter or click Send to broadcast the message to the channel. To share your map with a user, select the user in the list and click the ‘Share Map’ button. The user has to accept map sharing and you will be notified when it happen. Once the map is shared, you pan, zoom and switch map types. All of these actions are immediately replicated with the other user.