Maybe kludgy, but could be very quick to do depending on your structure: in a custom module:

/**
 * Implementation of hook_menu().
 */
 function example_menu() {
  
  $items['test/page'] = array(
    'title' => 'Test Page Title',
    'page callback' => 'test_page',
'access arguments' => array('access content'), 
'type'=>MENU_NORMAL_ITEM
  );
  
  return $items;
}

function test_page(){
$request = drupal_http_request("http://www.example.com/pages/test.php");
return $request->data;
}

 
Date: Tue, 21 Jun 2011 12:29:20 -0500
From: Scott Massey <scott.massey@gmail.com>
Subject: [support] Integrating completely unrelated pages into Drupal
To: support@drupal.org
Message-ID: <BANLkTik7m+C8r1-MrBdG1OG2zkgvxovQWA@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Hi!

I am about 6 months into Drupal and enjoy it immensely. I am putting
together a portfolio of some web development I have done and have several
pages of data visualiztions using php and a javascript library called
Protovis. If I want to bring that into drupal as a page, is there a way to
do that? There are library calls, jquery, etc. I am having trouble wrapping
my head around how to do it. I would like the pages to be a menu item that
opens a page within the drupal site. Here is an example of a page:
http://modernamericanman.com/ids499/protovis7.php

Thanks!

Scott