The content from there can also be fed into Yahoo Pipes for any filtering you want to do. Given the plethora of HN related pipes it seems like everybody just creates their own. Having said that if you want somewhere to start I use http://pipes.yahoo.com/pipes/pipe.info?_id=c0d729843a9b9e8de...
It looks like it is now just a redirect to http://andrewtrusty.appspot.com/readability/feed?url=http%3A... which if you de-construct the url leads to a more generic solution.
The content from there can also be fed into Yahoo Pipes for any filtering you want to do. Given the plethora of HN related pipes it seems like everybody just creates their own. Having said that if you want somewhere to start I use http://pipes.yahoo.com/pipes/pipe.info?_id=c0d729843a9b9e8de...