A way to turn your Dopplr trip feed into a php array of place, start and end timestamps, and lat/lon coordinates. Ugly coding, but it works.

gistfile1.php[345]

<?php

$url = "YOUR_DOPPLR_FEED_URL"; //Available from http://www.dopplr.com/account - "Atom feed of all your trips"

//-------

$old = array('xmlns=', 'gml:', 'georss:', 'gd:'); //super hack for lack of proper namespace support
$new = array('ns=', 'gml-', 'georss-', 'gd-');
$xml = new SimpleXMLElement(str_replace($old, $new, file_get_contents($url)));

$places = array();
$i=0;
foreach($xml->entry as $entry){
        $places[$i]['place'] = strip_tags($entry->title->asXML());
        $times = $entry->xpath('gd-when');
        $time = $times[0];

        $places[$i]['start'] = strtotime(str_replace(array(' startTime="', '"'), '', $time->attributes()->startTime->asXML())) + 3600;
        $places[$i]['end'] = strtotime(str_replace(array(' endTime="', '"'), '', $time->attributes()->endTime->asXML())) + 3600; //super hacky and horrid, with an extra hour for TZ mess
        $points = $entry->xpath('georss-where/gml-Point');
        list($lat, $lon) = explode(' ', trim(strip_tags($points[0]->asXML())));
        $places[$i]['lat'] = $lat;
        $places[$i]['lon'] = $lon;
        $i++;
}

return $places; //Do with this array as you wish. 

?>