the best way to scrape HN would be for each user to submit an item's HTML or its cache of it when idle and when called upon. It could do a pre-check of the item, the time, size, # comments then do the whole page if called upon. You could keep a tally of who's submitting what. The system could go open-source as I'm sure other sites could use it. Perhaps the plugin just digs into a brower's cache at set periods of time. There might be copyright issues.