algo asi se me ocurre, espero que sea esto lo que buscas
Código PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Documento sin título</title>
</head>
<body>
<?
foreach($_POST["select"] as $dato)
echo $dato."<br>";
$aTmp = array("a","b","c","d","e","f","g","h","i","j","k","l","m","n","ñ","o","p","q","r","s","t","u","v","w","x","y","z");
?>
<form id="form1" name="form1" method="post" action="">
<select name="select[]" size="10" multiple="multiple">
<?
foreach($aTmp as $dato)
echo "<option value=\"$dato\">$dato</option>";
?>
</select>
<input type="submit" name="Submit" value="Enviar">
</form>
</body>
</html>