I'm pretty happy for just using delicious for that. It's always nicer when sites interact well with existing sites instead of bolting on a half assed version of the same functionality. Not to say that Paul's in the business of half assing things, but rather that it's slightly orthogonal to the main value of news.yc and already exists (done well).
The way to do this is to go to the feature request thread and put in your point. People will vote it up there if they like it. This keeps the rest of YC news clear of feature requests and focuses more on start up stuff.<p><a href="http://news.ycombinator.com/comments?id=363">http://news.ycombinator.com/comments?id=363</a>
This is a useful feature, but as I understand YC already supports it. <p>Assuming you only upvote the stories that you actually are interested in, you should have an easy record of all of them by going to your user page.<p>
If you use an aggregator that preserves the history of the feed, then you have access to all the past articles. A bit of a hack though and it will be nice when it's actually part of the site.
paul, could you add some words from the story's title to the title tag for the page? So that when we bookmark, it's not always the same "YC Startup News"...