I check the HN front page several times per day usually, and have recently become interested in better ways that I might be able to do this more efficiently.
A) What 3rd party sites/extensions do people use and what are their advantages?
B) What would you like that doesn't seem to be possible? (e.g marking stories you've read etc.)
I've discovered http://hckrnews.com/ which looks promising for looking back for the 'best picks' of the last few days when you've not been about. What else is there that you'd recommend?