List of web services
http://techmagazine.ws/full-web-20-api-list/
On PHP
http://symfonydeveloper.wordpress.com/2007/11/22/creating-a-facebook-app-with-symfony/
http://www.zend.com///forums/index.php?t=msg&goto=14154
http://no.php.net/soap
http://www.onlamp.com/pub/a/php/2003/07/03/php_amazon_soap.html
