HN does have an RSS feed at http://news.ycombinator.com/rss http://news.ycombinator.com/rss. As to filtering by upvotes: you might be able to figure something

HN does have an RSS feed at http://news.ycombinator.com/rss http://news.ycombinator.com/rss. As to filtering by upvotes: you might be able to figure something out with Pipes (although I'm not sure how).