It would be even better if it displayed as much information as HN knows about the site. Instead of "plus.google.com", "Jonathan Rockway's Google+" would be even more useful. It would also be good if it could correlate these sites with usernames on HN. (Making it "jrockway's Google+" in that case.)
Ooh! I like that a lot, but then HN would have to rework their code to be parse Google+, but no other site, for the person's name. If only Google+ would enable vanity URLs already...
