Hacking on the Facebook Platform

I've been toying with the Facebook Platform the the past few days and am impressed by it thus far, minus the lack of documentation and usage examples. I created a base class to extend applications from in order to get a feel for how application are structured. It is based after the only coherent piece of documentation I have been able to find, here. I will publish my code soon; in the mean time, here is an example:

class FacebookApplication {
...
     function get_friends_with_app_installed() {
             $fql = "SELECT uid from user where uid in (SELECT uid2 FROM friend WHERE uid1=".$this->get_client_id().") and is_app_user=1;";
             return $this->get_client()->api_client->fql_query( $fql );
     }
}

class LookMiiUpFacebookApp extends FacebookApplication {
...
   function splash() {
           echo "lookmiiup splash";
           print_r( $this->get_friends_with_app_installed() );
   }

   function set_info() {
           $wii = strip_tags($_REQUEST["wii"]);

           $facebook = $this->get_client();
           $user = $this->get_client_id();

           $facebook->api_client->profile_setFBML("Wii Number: $wii", $user);
           $facebook->api_client->feed_publishActionOfUser( "got a new Wii number", "$wi
i" );

           echo "wii: $wii";
   }

   function handle_request() {
           static $allowed_methods = array(
                   "set_info"
           );

           if( in_array( $method, $allowed_methods ) ) {
                   $params = array();
                   call_user_func_array( array( $this, $method ), $params );
           } else {
                   parent::handle_request();
           }
   }

}

$fbapp = new LookMiiUpFacebookApp( $appapikey, $appsecret, $appcallbackurl );

$fbapp->require_login();
$fbapp->require_installation();

$fbapp->handle_request();

The added value is the ability to more intuitively (in my opinion, anyway) create an application that requires login/installation and setup the handler methods. I plan to use it, with Smarty for FBML generation, to integrate LookMiiUp into Facebook.