Rails - Oct 2011 - Find a [whatever] near you with Rails and the Google Map

Has anyone built a "Find a Physician" or "Find a Dealer" or
whatever using Rails and the Google Maps api? I''ve found a large number
of tutorials ca. 1996/7 and one seemingly current project on Github for a
general-purpose Google Maps connector gem, but I''m hoping to find some
tips about using the map to find the nearest physician''s practice to
the customer''s Zip code. There would be a few hundred practice
locations, all in upstate NY, if that makes any difference.

I''m very familiar with doing this in the traditional Great Circle
calculation, but I was interested in learning a new trick -- how to do this with
the Google Map -- seeing as that might be more accurate in a sparsely populated
area.

Thanks in advance,

Walter

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