[TheMusicMan]

Here's something I spotted the other day on my webhosts forums.

http://www.xpenguin.com/calcbandi.php

... and then setup a cron file that checks your pages every 30 minutes or so and updates a file with your bandwidth usage for the day.

Then you could a header that gets included in all pages with a simple:

PHP Code:

   CODE
   
  <?php
  
  if($bandwidth > 120000)
    echo "Sorry, try back tomorrow. Donations are appreciated.";
  
  else
    //display the normal page
  
  ?>

(Oversimplified a bit of course)