Implementando o aspSmartUpload

Formulário (upload.html)

<html>
<body bgcolor="#FFFFFF">
   <form method="POST" enctype="multipart/form-data" action="upload.asp">
      <input type="FILE" size="40" name="FILE1"><br>
      <input type="FILE" size="40" name="FILE2"><br>
      <input type="FILE" size="40" name="FILE3"><br>
      <input type=submit value="Upload!">
   </form>
</body>
</html>

Script de Upload (upload.asp)

Dim objUpload
Set objUpload = Server.CreateObject("aspSmartUpload.SmartUpload")
objUpload.MaxFileSize = 150000
objUpload.Upload
x = objUpload.Save("/diretorio")
Response.Write "Upload efetuado com sucesso"

Documentação do fabricante:http://www.aspsmart.com/aspSmartUpload/