At LA startupweekend I built with one other team member http://loc.is
a geolinking service that computes a geohash for gps coordinates or a
street address.  The resulting geolink will provide a map, and some
other interesting information when a user clicks the link.

It’s kinda a little cobbled together, but by dec.3rd it should be working well.

What would you want on the landing page?