Encore mieux, avec implode, il construit la liste automatiquement à partir du tableau

<?php
$exclure = array("201.234.223.234",
"32.332.112.234",
"55.355.234.123");

$str_exclure = implode(", ", $exclure);


$sql = "SELECT COUNT(*) AS stat ".
       "FROM logs ".
       "WHERE page='/tutorat/firefox/quebec.php'
           AND ip NOT IN ('.$str_exclure.')";
$retour1 = mysql_query($sql);
?>

<?php
$exclure = array("201.234.223.234",
"32.332.112.234",
"55.355.234.123");


$sql = "SELECT COUNT(*) AS stat ".
       "FROM logs ".
       "WHERE page='/tutorat/firefox/quebec.php' ";
foreach($exclure as $ip)
{
    $sql .= "AND ip <> '". $ip ."' ";
}
$retour1 = mysql_query($sql);
?>

$retour1 = mysql_query("SELECT COUNT(*) AS stat FROM logs WHERE page='/tutorat/firefox/quebec.php' ");

$retour1 = mysql_query("SELECT COUNT(*) AS stat FROM logs WHERE page='/tutorat/firefox/quebec.php' AND ip=PAS'123.123.123.123' ");