1) install the Alexa toolbar into your browser.
2) Create a special webpage that contains a JavaScript array of webpage addresses from your site. Then create a JavaScript function that loops through the array and opens each address into a separate browser window (make sure they all use the same window). Between cycles through the function, cause the function to "sleep" using the "timer()" function for a random interval of time between say 5 and 45 seconds. Make sure that when the function reaches the end of the array of addresses it loops back to the beginning.
3) Periodically set the script to action in your browser with the Alexa toolbar installed and let it churn away overnight. To save bandwidth you can always disable the loading of images. If you want it to be really effective, have a few friends run the same script from their browsers with the Alexa toolbar installed.
