I've built a tool that does more or less exactly this - give it a try, maybe even send some feedback - http://www.geopeeker.com http://www.geopeeker.com Update

I've built a tool that does more or less exactly this - give it a try, maybe even send some feedback - http://www.geopeeker.com http://www.geopeeker.com Updates are in progress that will let you do all sorts of tweaks to the agent, even the DOM.