Am I missing something or does this not work for the majority of us who are casual commentators on here?
Most of the techniques for this sort of thing don't work that well for sparse datasets. So given a choice between showing bad results for users with relatively few comments, and not showing any results ... especially when users can search not just for themselves but also for folks they know and enjoy ... Also, scraping the full history of HN is not cool.
http://news.ycombinator.com/item?id=271066
I'd check the Internet Archive for the files & Google for the filenames.