I thought I would put together an example using Ajaxian techniques, JSRS and Google Maps. Click here to go see the example. Quoted from that page:

This is just a prototype example using Ajaxian techniques, JSRS (Javascript Remote Scripting), and Google Maps to show how one could display network monitoring updates in real-time. I started putting this together about a month ago when there were just two known implementations using Google Maps out on the net. One was Chicago Crime Maps and the other was Housing Maps. It really only took me a couple days to put together as I only had a few hours here and there over the time period to actually work on it. I'm usually too busy getting paid to do this kind of stuff so I don't normally spend time like this just for fun anymore. Since starting Google has changed the Map implementation a couple times so I had to fix things and now they've actually come out with a Google Maps API to make things a million times easier so people don't have to hack this stuff together. They were a couple weeks too late so I'm still using old techniques here that will likely stop working at some point.