A full example on how to get latitude and longitude from SimpleGeo's Place API with a US postal address.

SimpleGeoRubyExample.rb

# Using Ruby 1.9.2
require 'simplegeo'
require 'json'

full_address = "960 West University Dr #103 Tempe, AZ"
geo_options = {'radius' => 0.1}

closest_locations = SimpleGeo::Client.get_places_by_address(full_address, geo_options)
coordinates = JSON.parse(closest_locations.to_json)['features'][0]['geometry']['coordinates']
longitude = coordinates[0]
latitude = coordinates[1]