aggregators - How do craigslist mashups get data? -

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i'm doing research work content aggregators, , i'm curious how of current craigslist aggregators data mashups.

for example, www.housingmaps.com , closed www.chicagocrime.org

if there url can used reference, perfect!

for adravage.com use combination of magpie rss (to extract data returned searches) , custom screen scraping class populate city/category information used when building searches.

for example, extract categories could:

//scrape category data $h = new http(); $h->dir = "../cache/";  $url = "http://craigslist.org/";  if (!$h->fetch($url, 300)) {   echo "<h2>there problem http request!</h2>";         exit(); }  //we need category abbreviations (data looks like: <option value="ccc">community) preg_match_all ("/<option value=\"(.*)\">([^`]*?)\n/", $h->body, $categorytemp);  $catnames = $categorytemp['2'];   //return array of abreviations if(sizeof($catnames) > 0)        return $catnames;    else     return $emptyarray = array();

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