Email Route Map. A lovely little Google Maps mashup which lets you trace where your email messages have come from geographically. Just enter in the header information from the message you want to trace and off it goes. For some strange reason, some of my stuff is going through an obscure European town before arriving here. Fascinating.
Paste an email with full headers (we need the ‘Received’ lines — we don’t need your email addresses, digg). The app will (we hope) trace the path your email message took as it passed through various servers, on Google maps. 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.