OpenID is not a bad idea, but I think it's non-essential. What am I missing?
But the point is, most people don't care about reusing passwords. Even most people on HN.
This is just another example of us techies getting distracted by things we care about. The goal is to build something people will use. Privacy just doesn't matter. (http://gettingreal.37signals.com/ch05_It_Just_Doesnt_Matter....)
And,thanks for the kudos on the design. I've been tweaking it quite a bit the past month. I've found the summaries useful as well. I have a hunch that one of the reasons that Digg has outpaced Reddit for quite some time, is that Google has more text to index with Digg's summaries, and is therefore more Google friendly and gets more organic search traffic. We'll see how that decision pans out.
On the positive side, your design/stylesheet is much better than HN, IMO. (For example, on HN I keep voting up/down when I mean the opposite because the damn arrows are too close to each other.) Having 1-2 line summaries of articles is also very useful.