Butterfat.net has produced a Google Maps mashup with a box: paste in your email header and it will plot a traceroute showing the servers used on a Google map of North America. Unfortunately, butterfat didn't include maps of Europe etc, so if you scross across the pond, the push pins appear on a blank grey space....
Note: "It only takes the last 4 or so servers and is limited by hostip's ability to provide a lat/long coordinate for the given IP."
Butterfat's Google map of unprotected/open camera streams, however, does cover the whole world....
