Finally, a free geocoding API

REST Query to look up an address
http://local.yahooapis.com/MapsService/V1/geocode?appid=rlerdorf&location=Dunedin
Returned XML
We can parse it like this
<?php
  $url  
'http://local.yahooapis.com/MapsService/V1/geocode';
  
$url .= '?appid=rlerdorf&location='.urlencode('Dunedin');
  
$xml simplexml_load_file($url); 
  
$ret['precision'] = (string)$xml->Result['precision'];
  
$ret['warning'] = (string)$xml->Result['warning'];
  foreach(
$xml->Result->children() as $key=>$val) {
    if(
strlen($val)) $ret[(string)$key] =  (string)$val;
  }
  echo 
"<pre>"print_r($ret); echo "</pre>";
?>
Output