[armpit]

In case anyone is still interested in this, it is pretty easy. Just add it as a foum block. (Replace 'HeadShotCommunity' with your own group)

I knocked this up in about 2 minutes, would be easy to expand on.

PHP Code:

$gUrl = 'http://steamcommunity.com/groups/HeadShotCommunity/memberslistxml/?xml=1';
$r = '';

$xmlstring = file_get_contents($gUrl);
ini_set('default_socket_timeout', 0);

$xml  = simplexml_load_string($xmlstring);
$json = json_encode($xml);
$ar   = json_decode($json, TRUE);
$gd   = $ar['groupDetails'];

$r .= "<div>Members: ".$gd['memberCount']."</div>";
$r .= "<div><font style='color: #8bc53f;'>In Game:</font> ".$gd['membersInGame']."</div>";
$r .= "<div><font style='color: #62a7e3'>Online:</font> ".$gd['membersOnline']."</div>";

return $r;