Mologogo is a mobile phone Google Maps friend finder - From the website: Mologogo is a free service that will track a friends GPS enabled cell phone from another phone or on the web. Mologogo also serves as a dirt-cheap tracking system. It currently works on pretty much any Nextel phone with Java and GPS. A Blackberry client download is also available.
MeHere is a GPS tracker for Google Maps - Here is a new Google Maps GPS tracker that also serves up the GPS coordinates of its user for use by script developers, so people making maps apps would be able to incorporate their visitor's location into the maps.
..While we're on the subject here is a "How-To" for Converting Google Maps search results to GPS waypoints
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