Ciao,
vedi se può andar bene.

Pagina principale:
codice:
<html>
<head>
   <script type="text/javascript">
      function stampa(){
         window.open('stampa.htm','stampa','width=500, height=200, left=0, top=0, scrollbars=auto, resizable=no');
      }
   </script>
</head>
<body>
   <form>
      Nome <input type="text" id="nome" />
      

      Cognome <input type="text" id="cognome" />
      

      <input type="button" value="stampa" onclick="stampa();" />
   </form>
</body>
</html>
stampa.htm:
codice:
<html>
<head>
</head>
<body>
   

Nome: <span id="nome"></span></p>
   

Cognome: <span id="cognome"></span></p>
   <script type="text/javascript">
      document.getElementById('nome').innerHTML = opener.document.getElementById('nome').value;
      document.getElementById('cognome').innerHTML = opener.document.getElementById('cognome').value;
   </script>
</body>
</html>