Cool idea. Anyway, I created a Top Stories Directory 2 days ago too. It will record down every number one stories starting from 2 days ago. But, it lost tracking some stories due to some bugs. But, I already fixed them all.
Nearlyfreespeech.net doesn't have cron yet, so I'm using onlinecronjobs.com. If you want to scrape it on demand just go to http://hnweekly.watdahel.com/index/scrape