I worry about News.YC being a time sink, so here's a crazy idea: what if it were turned off a few hours a day? Time zones are obviously a problem, but we can tell when most users are active from the logs, so if we went black for a few hours during that time we'd help the most people.
It seems worth at least trying. Just a few hours would be enough to break most people's cycle of procrastination. And if anything it might improve the feeling of community, because users would tend to all show up together at opening time.
As for the notion of improving the feeling of community by having everybody turn up at once... do we REALLY want to get dozens of posts all at once? It seems to me that having a fixed "opening time" would interfere with the site more than aid it.