"Ever since I'd been working on various Google Maps hacks I'd been thinking, 'Hmmm, I've done Gmail hacks and Gmaps hacks, what could I do that would combine both?'. ... I decided to parse incoming messages for geographic locations and provide a way to view a map of the location...

This page includes some very basic instructions for using an initial rough version of this functionality that only maps US State/Zip codes locations. (The current version is a bookmarklet, but it would be ideal for a GreaseMonkey script...)"

   – stuff.rancidbacon.com/gmailmap ...

--Phil.