Until someone does you can use the following HNSearch queries: [1], [2] and [3] (roughly best to wrost). Note that you'll get HN apps along with HN clones.
It's not really "ripping off" anything given that the structure and css are included with the Arc distro which a lot of these sites appear to be using.
well, to be fair, if this is any indication of how deeply integrated markup, data and code are in an Arc application, making any kind of changes to the rendered document would be potentially horribly painful: https://github.com/wting/hackernews/blob/master/html.arc
(sorry... I'm sure people think this is awesome because zomg Lisp but in any other language it would be derided as "spaghetti code")
I do wonder if there's such a thing as a web framework in a Lisp, Arc or what have you, with templating and a url router and all that. Or if that's even possible. Or if the Lisp community would recoil in horror at the very thought.
I mean I know (as far as I know) this was pg's pet project and it's taken off like nothing i've written ever has, but I can't see it selling a blub like me on the language. Nothing makes me want to touch a Lisp less than seeing it.