Perhaps what would be more useful is an RSS feed. That way you get standard newsreader features like mark-as-read and show-unread and sort-by-newest for free.
Of course you don't get the sorting, but them's the breaks.
It's a good thing that all the "Ask HN" threads (more generally, all the threads without external URL links) are now aggregated under the "ask" link at the top of most pages, as the feature request thread
One reason public transport is bad in most US cities is that rich people rarely use it.