Google Maps is a web of linked XML documents

Link: Jon Udell: Google Maps is a web of linked XML documents.

Then, today, somebody1 this article pointed out something that just knocked my socks off. You can append "output=xml" to any Google Maps URL and receive raw XML. Here's a trivial use of that feature:

Google Maps is really amazing in its DHTML + JavaScript user interface, as well as it seems to use XML backend data available for everyone :)