Wanna build a "best of HN/insert-feed-here" daily feed? Or it exists?

I love HN but I don't have time to read the 1,000 new posts and thousands of awesome comments every day. I'd love to have a program that, say, every hour looks at the posts from the last X hours and selects the one that was commented on or retweeted (or most-something by whatever metric) and then posts that one post to an RSS feed/page/twitter. So I can just get the, say, 5 best posts per day. Or something like that. This system could be expandable to use for any RSS feed (i.e., I want to subscribe to, say, Andrew Warner's friggin' awesome twitter but he posts so much, I just want to see his best post per day!). I would love this system and I'd help build it, market it. We can open source it! Would this interest anyone? Or does anything like this exist? It would be a fun project! :) Thoughts? (I'm new here so I'm sorry if there are any problems with this post.)